Urea derivatives as integrin α4 antagonists

1. A compound of the general Formula Ia:

or a pharmaceutically acceptable salt thereof,

wherein:

A represents a —CH— group or a nitrogen atom;

R1 is C 3-10 alkyl, C 3-10 alkenyl, C 3-10 alkynyl, C 3-10 cycloalkyl, C 3-10 cycloalkyl-C 1-10 alkyl, C 3-10 cycloalkyl-C 2-10 alkenyl, C 3-10 cycloalkyl-C 2-10 alkynyl, 3- to 10-membered heterocyclyl, 3- to 10-membered heterocyclyl-C 1-10 alkyl, 3- to 10-membered heterocyclyl-C 2-10 alkenyl, 3- to 10-membered heterocyclyl-C 2-10 alkynyl, C 6-10 aryl, C 6-10 aryl-C 1-10 alkyl, C 6-10 aryl-C 2-10 alkenyl, C 6-10 aryl-C 2-10 alkynyl, 5- to 10-membered heteroaryl, 5- to 10-membered heteroaryl-C 1-10 alkyl, 5- to 10-membered heteroaryl-C 2-10 alkenyl, or 5- to 10-membered heteroaryl-C 2-10 alkynyl; wherein said alkyl, alkenyl, and alkynyl groups or moieties are unsubstituted or substituted with one to four substituents, which may be the same or different and are independently selected from Ra; and wherein said cycloalkyl, heterocyclyl, aryl and heteroaryl groups or moieties are unsubstituted or substituted with one to four substituents, which may be the same or different and are independently selected from Rb;

R2 is hydrogen, C 1-6 -alkyl, C 0-2 alkyl-C 3-10 cycloalkyl, C 0-2 alkyl-C 6-10 aryl, or C 0-2 alkyl-5- to 10-membered heteroaryl, C 3-10 cycloalkyl-C 0-2 alkyl, C 6-10 aryl-C 0-2 alkyl or 5- to 10-membered heteroaryl-C 0-2 alkyl, wherein said aryl and heteroaryl groups or moieties are unsubstituted or substituted with one to four substituents, which may be the same or different and are independently selected from Ra;

R5 is C 1-6 -alkyl, C 3-10 cycloalkyl, C 3-10 cycloalkyl-C 1-4 alkyl, 3- to 10-membered heterocyclyl, 3- to 10-membered heterocyclyl-C 1-4 alkyl, C 6-10 aryl, C 6-10 aryl-C 1-4 alkyl, 5- to 10-membered heteroaryl, or 5- to 10-membered heteroaryl-C 1-4 alkyl; wherein said alkyl groups or moieties are unsubstituted or substituted with one to four substituents, which may be the same or different and are independently selected from Ra; and wherein said cycloalkyl, heterocyclyl, aryl and heteroaryl groups or moieties are unsubstituted or substituted with one to four substituents, which may be the same or different and are independently selected from Rb;

L1 is —S—, —S(O)—, —S(O) 2 —, —C(O)—, —C(O)O—, —C(S)—, —N(Rc)—, —CH 2 —, —CH 2 N(Rc)—, —CON(Rc)—, —CSN(Rc)—, —N(Rc)CO—, —N(Rc)CS—, —S(O) 2 N(Rc)— or —N(Rc)S(O) 2 —;

L2 is a covalent bond, —O—, —S—, —S(O)—, —S(O) 2 —, —C(O)—, —C(O)O—, —OC(O)—, —C(S)—, —N(Rc)—, —CON(Rc)—, —OC(O)N(Rc), —CSN(Rc)—, —N(Rc)CO—, —N(Rc)C(O)O—, —N(Rc)CS—, —S(O) 2 N(Rc)—, —N(Rc)S(O) 2 —, —N(Rc)CON(Rc)—, or —N(Rc)CSN(Rc)—, wherein if two Rc substituents are present, these may be the same or different;

W is O, S, NH, N(Rc), or NCN;

Z is —C(O)ORd, —P(O) 2 ORd, —S(O) 2 ORd, —S(O) 2 N(Rd)(Rd), —S(O) 2 N(Re)C(O)Rd, -5-tetrazolyl, or —C(O)Rd; wherein if two Rd groups are present these may be the same or different;

Ra is —ORe, —NO 2 , halogen, —S(O)Re, —S(O) 2 Re, —SRe, —S(O) 2 ORe, —S(O)NReRe —S(O) 2 NReRe, —NReRe, —O(CReRe) m NReRe, —C(O)Re, —CO 2 Re, —CO 2 (CReRe) m CONReRe, —OC(O)Re, —CN, —C(O)NReRe, —NReC(O)Re, —OC(O)NReRe, —NReC(O)ORe, —NReC(O)NReRe, —CRe(N—ORe), —CFH 2 , —CF 2 H, or —CF 3 ; wherein if two or more Re groups are present these may be the same or different;

Rb is a group selected from —ORe, —NO 2 , halogen, —S(O)Re, —S(O) 2 Re, —SRe, —S(O) 2 ORe, —S(O)NReRe —S(O) 2 NReRe, —NReRe, —O(CReRe) m NReRe, —C(O)Re, —CO 2 Re, —CO 2 (CReRe) m CONReRe, —OC(O)Re, —CN, —C(O)NReRe, —NReC(O)Re, —OC(O)NReRe, —NReC(O)ORe, —NReC(O)NReRe, —CRe(N—ORe), —CFH 2 , —CF 2 H, —CF 3 , C 1-6 alkyl, C 2-4 alkenyl, C 2-4 alkynyl, C 3-10 cycloalkyl, C 3-10 cycloalkyl-C 1-4 alkyl, 3- to 10-membered heterocyclyl, 3- to 10-membered heterocyclyl-C 1-4 alkyl, C 6-10 aryl, C 6-10 aryl-C 1-4 alkyl, 5- to 10-membered heteroaryl or 5- to 10-membered heteroaryl-C 1-4 alkyl; wherein said alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl and heteroaryl groups or moieties are unsubstituted or substituted with one to four substituents which may be the same or different and are independently selected from Ra;

Rc is hydrogen, C 1-10 alkyl or C 3-10 cycloalkyl; wherein said alkyl or cycloalkyl groups or moieties are unsubstituted or substituted with one to four substituents which may be the same or different and are selected from Ra;

Rd is hydrogen, C 1-6 alkyl, C 3-10 cycloalkyl, C 3-10 cycloalkyl-C 1-4 alkyl, 3- to 10-membered heterocyclyl, 3- to 10-membered heterocyclyl-C 1-4 alkyl, C 6-10 aryl, C 6-10 aryl-C 1-4 alkyl, 5–10-membered heteroaryl, or 5- to 10-membered heteroaryl-C 1-4 alkyl; wherein said alkyl, cycloalkyl, heterocyclyl, aryl and heteroaryl groups or moieties are unsubstituted or substituted with one to four substituents which may be the same or different and are independently selected from Ra;

Re is hydrogen, or C 1-4 alkyl;

p is an integer from 0 to 4; and

m is an integer from 1 to 6.

2. A compound according to claim 1 , wherein R1 is C 3-6 alkyl, C 3-10 cycloalkyl, C 3-10 cycloalkyl-C 1-4 alkyl, 3- to 10-membered heterocyclyl, 3- to 10-membered heterocyclyl-C 1-4 alkyl, C 6-10 aryl, C 6-10 aryl-C 1-4 alkyl, 5- to 10-membered heteroaryl, 5- to 10-membered heteroaryl-C 1-4 alkyl; wherein said alkyl groups or moieties are unsubstituted.

3. A compound according to claim 1 , wherein L1 is —CH 2 —, —S—, —S(O)—, —S(O) 2 —, —C(O)—, —NH—, —CON(Rc)—, or —S(O) 2 N(Rc)—.

4. A compound according to claim 3 , wherein L1 is —CH 2 —, —S(O)—, —S(O) 2 —, —CON(Rc)—, or —S(O) 2 N(Rc)—.

5. A compound according to claim 1 , wherein R2 is hydrogen, C 1-5 alkyl, cyclohexylmethyl, benzyl or cyclopropylmethyl.

6. A compound according to claim 1 , wherein W is S or O.

7. A compound according to claim 1 , wherein Z is —COOH or —C(O)O-methyl.

8. A compound according to claim 1 , wherein L2 is a covalent bond or a group —N(Rc)CO—, —OC(O)N(Rc)—, —N(Rc)— or —O—.

9. A compound according to claim 1 , wherein R5 is an C 6-10 aryl, C 6-10 aryl-C 1-4 alkyl, 5- to 10 membered heteroaryl or 5- to 10-membered heteroaryl-C 1-4 alkyl group.

10. A compound according to claim 1 , wherein -L2-R5 represents 3,5-dichloropyridine-4-carbonylamino, N,N-dimethylcarbamoyl, 4-methylpiperazincarbamoyl, 2,6-dichlorobenzylamino, 3,5-dichloropyridin-4-methylenamino, 2-cyanophenyl, 2-methoxyphenyl, [2,6]naphthyridinyloxy, [2,6]naphthyridinylamino, [2,7]naphthyridinyloxy, [2,7]naphthyridinylamino or 3-cyano[1,6]naphthyridinylamino.

11. A compound according to claim 1 , wherein the compound of formula Ia has S-configuration at the carbon alpha to the group Z.

12. A compound according to claim 1 , wherein the compound of formula Ia is:

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)-6-methoxyphenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)-6-methoxyphenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(methylphenylcarbamoyl)phenyl]ureido}propionic acid methyl ester

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(methylphenylcarbamoyl)phenyl]ureido}propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(piperidine-1-carbonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(piperidine-1-carbonyl)phenyl]ureido}propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[5-methoxy-2-(piperidine-1-carbonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[5-methoxy-2-(piperidine-1-carbonyl)phenyl]ureido}propionic acid

(S)-2-{3-[2-(Cyclohexylisopropylcarbamoyl)-5-methoxyphenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-{3-[2-(Cyclohexylisopropylcarbamoyl)-5-methoxyphenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-[3-(2-phenylaminophenyl)ureido]propionic acid methyl ester

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-[3-(2-phenylaminophenyl)ureido]propionic acid

(S)-2-[3-(4-Benzenesulfonylphenyl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-[3-(4-Benzenesulfonylphenyl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[4-(4-nitrobenzenesulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[4-(4-nitrobenzenesulfonyl)phenyl]ureido}propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(4-methylpiperazine-1-carbonyl)phenyl]ureido}propionic acid

(S)-2-{3-[2-(Butylthiophen-2-ylmethylsulfamoyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-(3-{2-[(thiophen-2-ylmethyl)sulfamoyl]phenyl}ureido)propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-[3-(2-phenylsulfamoylphenyl)ureido]propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)-3-methylureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-[3-(2-Benzylcarbamoylphenyl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-[3-(2-Cyclohexylcarbamoylphenyl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-[3-(2-phenylcarbamoylphenyl)ureido]propionic acid

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-[3-(2-tert-Butylcarbamoylphenyl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2,4-dichloro-6-(cyclohexylmethylcarbamoyl)phenyl]ureido}propionic acid

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)-6-methylphenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]-3-methylureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]-3-methylureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-2-{3-[2-(Cyclohexylmethylsulfamoyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-{3-[2-(Cyclohexylmethylsulfamoyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-[3-(2-Benzylphenyl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzylphenyl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-[3-(2-phenylsulfanylphenyl)ureido]propionic acid methyl ester

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-[3-(2-phenylsulfanylphenyl)ureido]propionic acid

(S)-2-{3-[5-Chloro-2-(4-chlorobenzenesulfonyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-{3-[5-Chloro-2-(4-chlorobenzenesulfonyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-[3-(2-Benzenesulfonyl-5-chlorophenyl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonyl-5-chlorophenyl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-{3-[2,4-Dibromo-6-(cyclohexylmethylcarbamoyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-{3-[2,4-Dibromo-6-(cyclohexylmethylcarbamoyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(toluene-4-sulfonyl)-5-trifluoromethylphenyl]ureido}propionic acid methyl ester

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(toluene-4-sulfonyl)-5-trifluoromethylphenyl]ureido}propionic acid

(S)-2-{3-[2-Chloro-5-(toluene-4-sulfonyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-{3-[2-Chloro-5-(toluene-4-sulfonyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-{3-[5-Chloro-2-(2,5-dimethoxybenzenesulfonyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-{3-[5-Chloro-2-(2,5-dimethoxybenzenesulfonyl)phenyl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-[3-(2-Benzenesulfonylpyridin-3-yl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonylpyridin-3-yl)ureido]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-(2′,6′-dimethoxybiphenyl-4-yl)propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-(2′,6′-dimethoxybiphenyl-4-yl)propionic acid

(S)-3-{4-[(3,5-Dichloropyridine-4-carbonyl)amino]phenyl}-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-{4-[(3,5-Dichloropyridine-4-carbonyl)amino]phenyl}-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-2-{3-[5-Chloro-2-(2,5-dimethoxybenzenesulfonyl)phenyl]ureido}-3-{4-[(3,5-dichloropyridine-4-carbonyl)amino]phenyl}propionic acid methyl ester

(S)-2-{3-[5-Chloro-2-(2,5-dimethoxybenzenesulfonyl)phenyl]ureido}-3-{4-[(3,5-dichloropyridine-4-carbonyl)amino]phenyl}propionic acid

(S)-2-{3-[2-(Cyclohexylmethylsulfamoyl)phenyl]ureido}-3-{4-[(3,5-dichloropyridine-4-carbonyl)amino]phenyl}propionic acid methyl ester

(S)-2-{3-[2-(Cyclohexylmethylsulfamoyl)phenyl]ureido}-3-{4-[(3,5-dichloropyridine-4-carbonyl)amino]phenyl}propionic acid

(S)-2-[3-(2-Benzenesulfonyl-5-chlorophenyl)ureido]-3-{4-[(3,5-dichloropyridine-4-carbonyl)amino]phenyl}propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonyl-5-chlorophenyl)ureido]-3-{4-[(3,5-dichloropyridine-4-carbonyl)amino]phenyl}propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-{4-[(3,5-dichloropyridine-4-carbonyl)amino]phenyl}propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-{4-[(3,5-dichloropyridine-4-carbonyl)amino]phenyl}propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(toluene-4-sulfonyl)pyridin-3-yl]ureido}propionic acid methyl ester

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(toluene-4-sulfonyl)pyridin-3-yl]ureido}propionic acid

(S)-2-{3-[2-(4-Chlorobenzenesulfonyl)pyridin-3-yl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

(S)-2-{3-[2-(4-Chlorobenzenesulfonyl)pyridin-3-yl]ureido}-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-methyl-3-[2-(piperdine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-methyl-3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[3-(1-phenylmethanoyl)phenyl]ureido}propionic acid

(S)-2-[3-(2-Benzylphenyl)-3-methylureido]-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}-phenyl)propionic acid methyl ester

(S)-2-[3-(2-Benzylphenyl)-3-methylureido]-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]ureido}-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]-3-methylureido}-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]-3-propylureido}-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]-3-cyclopropylmethylureido}-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]-3-pentylureido}-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid

(S)-2-{3-Benzyl-3-[2-(cyclohexylmethylcarbamoyl)phenyl]ureido}-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid

(S)-2-{3-Cyclohexylmethyl-3-[2-(cyclohexylmethylcarbamoyl)phenyl]ureido}-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-methyl-3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-methyl-3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[2-(4-methylpiperazine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[2-(4-methylpiperazine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-2-[3-(2-Cyclopentanesulfonylphenyl)ureido]-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid methyl ester

(S)-2-[3-(2-Cyclopentanesulfonylphenyl)ureido]-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[2-(2-methylpropane-2-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[2-(2-methylpropane-2-sulfonyl)phenyl]ureido}propionic acid

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[2-(7-methylthieno[2,3-b]pyrazin-3-ylsulfanyl)phenyl]ureido}propionic acid methyl ester

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[2-(7-methylthieno[2,3-b]pyrazin-3-ylsulfanyl)phenyl]ureido}propionic acid

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[2-(3,5-dichloropyridin-4-ylsulfanyl)phenyl]ureido}propionic acid methyl ester

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[2-(3,5-dichloropyridin-4-ylsulfanyl)phenyl]ureido}propionic acid

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-methyl-3-[2-(piperazine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)2-{3-methyl-3-[2-(piperazine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-(4-{[1-(2-chloro-6-methylpyridin-3-yl)methanoyl]amino}phenyl)propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-(4-{[1-(2,6-dichloropyridin-3-yl)-methanoyl]amino}phenyl)propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-(4-{[1-(3,5-dimethoxypyridin-4-yl)-methanoyl]amino}phenyl)propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-(4-{[1-(3,5-dibromopyridin-4-yl)-methanoyl]amino}phenyl)propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-(2,6-dichlorobenzylamino)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-(2,6-dichlorobenzylamino)phenyl]propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-{4-[(3,5-dichloropyrdin-4-ylmethyl)amino]phenyl}propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-{4-[(3,5-dichloropyridin-4-ylmethyl)amino]phenyl}propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-(4-dimethylcarbamoyloxyphenyl)propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-(4-dimethylcarbamoyloxyphenyl)propionic acid

4-Methylpiperazine-1-carboxylic acid 4-{(S)-2-[3-(2-benzenesulfonylphenyl)ureido]-2-methoxycarbonylethyl}phenyl ester

4-Methylpiperazine-1-carboxylic acid 4-{(S)-2-[3-(2-benzenesulfonylphenyl)ureido]-2-carboxyethyl}phenyl ester

3,5-Dichloroisonicotinic acid 4-{(S)-2-[3-(2-benzenesulfonylphenyl)ureido]-2-methoxycarbonylethyl}phenyl ester

3,5-Dichloroisonicotinic acid 4-{(S)-2-[3-(2-benzenesulfonylphenyl)ureido]-2-carboxyethyl}phenyl ester

(S)-3-(2′-Cyanobiphenyl-4-yl)-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-(2′-Cyanobiphenyl-4-yl)-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-3-(2′-Methoxybiphenyl-4-yl)-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-(2′-Methoxybiphenyl-4-yl)-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-([2,6]naphthyridin-1-ylamino)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-([2,6]naphthyridin-1-ylamino)phenyl]propionic acid

(S)-3-[4-([2,6]Naphthyridin-1-ylamino)phenyl]-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-[4-([2,6]Naphthyridin-1-ylamino)phenyl]-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-2-[3-(2-Benzylphenyl)-3-methylureido]-3-[4-([2,6]naphthyridin-1-ylamino)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzylphenyl)-3-methylureido]-3-[4-([2,6]naphthyridin-1-ylamino)phenyl]propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propionic acid

(S)-3-[4-([2,7]Naphthyridin-1-ylamino)-phenyl]-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-[4-([2,7]Naphthyridin-1-ylamino)-phenyl]-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-2-[3-(2-Benzylphenyl)-3-methylureido]-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzylphenyl)-3-methylureido]-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-([2,6]naphthyridin-1-yloxy)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-([2,6]naphthyridin-1-yloxy)phenyl]propionic acid

(S)-3-[4-([2,6]Naphthyridin-1-yloxy)phenyl]-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-[4-([2,6]Naphthyridin-1-yloxy)phenyl]-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-([2,7]naphthyridin-1-yloxy)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-[4-([2,7]naphthyridin-1-yloxy)phenyl]propionic acid

(S)-3-[4-([2,7]Naphthyridin-1-yloxy)phenyl]-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid methyl ester

(S)-3-[4-([2,7]Naphthyridin-1-yloxy)phenyl]-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid

(S)-2-[3-(2-Benzylphenyl)-3-methylureido]-3-[4-([2,7]naphthyridin-1-yloxy)phenyl]propionic acid methyl ester

(S)-2-[3-(2-Benzylphenyl)-3-methylureido]-3-[4-([2,7]naphthyridin-1-yloxy)phenyl]propionic acid

(S)-2-[3-(2-Benzylphenyl)-3-methylthioureido]-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid methyl ester

(S)-2-[3-(2-Benzylphenyl)-3-methylthioureido]-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]-3-methylthioureido}-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid methyl ester

(S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]-3-methylthioureido}-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid; or

(S)-3-(4-{[1-(3,5-Dichloropyridin-4-yl)methanoyl]amino}phenyl)-2-{3-[2-(piperidine-1-sulfonyl)phenyl]thioureido}propionic acid,

or a pharmaceutically acceptable salt thereof.

13. A process for producing a compound of formula Ia as defined in any one of claim 1 , and in which the group Z is a —COORd group and R2 is H, which process comprises reacting an amine of formula (III):

wherein Rd, R5 and L2 are as defined in any one of claim 1 with a corresponding isocyanate or isothiocyanate of formula (IV):

wherein W is O or S and A, R1, L1, Rb and p are as defined in claim 1 .

14. A process for producing a compound of formula Ia as defined in claim 1 , and in which the group Z is a —COORd group and R2 is as defined in claim 1 , which process comprises reacting an amine of formula (VI):

wherein A, R1, R2, L1, Rb and p are as defined in claim 1 with an isocyanate or isothiocyanate of formula (VII):

wherein W is O or S and R5, Rd and L2 are as defined in claim 1 .

15. A process for producing a compound of formula Ia as defined in claim 1 , and in which the group Z is a —COORd group and R2 is defined in claim 1 , which process comprises reacting an amine of formula (III):

wherein R5, Rd, and L2 are as defined in claim 1 with a carbamyl chloride of formula (IX):

wherein A, Rb, p, R1, R2 and L1 are as defined in claim 1 .

16. A composition comprising a compound as claimed in claim 1 , and a carrier.

17. A compound as claimed in claim 1 , wherein the compound is (S)-3-[4-(2,6-Dichlorobenzoylamino)phenyl]-2-{3-[2-(piperidine-1-sulfonyl)phenyl]ureido}propionic acid.

18. A compound as claimed in claim 1 , wherein the compound is (S)-2-{3-[2-(Cyclohexylmethylsulfamoyl)phenyl]ureido}-3-{4-[(3,5-dichloropyridine-4-carbonyl)amino]phenyl}propionic acid.

19. A compound as claimed in claim 1 , wherein the compound is (S)-2-[3-(2-Benzenesulfonyl-5-chlorophenyl)ureido]-3-{4-](3,5-dichloropyridine-4-carbonyl)amino]phenyl}propionic acid.

20. A compound as claimed in claim 1 , wherein the compound is (S)-2-[3-(2-Benzylphenyl)-3-methylureido]-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid.

21. A compound as claimed in claim 1 , wherein the compound is (S)- 2- {3-[2-(Cyclohexylmethylcarbamoyl)phenyl]ureido}-3-(4-{[1-(3,5-dichloropyridin-4-yl)methanoyl]amino}phenyl)propionic acid.

22. A compound as claimed in claim in claim 1 , wherein the compound is (S)-2-{3-[2-(Cyclohexylmethylcarbamoyl)phenyl]-3-methYlureido}-3-(4-}]1-(3,5-dichloropyridin-4-yl)methanoyl]amino}Phenyl)propionic acid.

23. A compound as claimed in claim 1 , wherein the compound is (S)-2-[3-(2-Benzenesulfonylphenyl)ureido]-3-{4-([2,6]naphthyridin-1-yloxy)phenyl]propionic acid.