P2X3 and/or P2X2/3 compounds and methods

1. A method for regulating one or both of P2X 3 or P2X 2/3 receptors in a subject, comprising administering a therapeutically effective amount of a compound, which is selected from the group consisting of:

1-{4-[2-Isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[2-Isopropyl-7-(1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-(4-{7-[2-(4-Chloro-phenyl)-1,1-dimethyl-ethylamino]-2-isopropyl-2H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-{4-[2-sec-Butyl-7-(1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[2-sec-Butyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-(4-{2-sec-Butyl-7-[2-(4-chloro-phenyl)-1,1-dimethyl-ethylamino]-2H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-{4-[2-Isobutyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[2-(1-Ethyl-propyl)-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[2-Phenyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

4-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxylic acid amide;

1-{4-[1-Isopropyl-4-(1-quinolin-3-yl-ethylamino)-1H-pyrazolo[3,4-d]pyrimidin-6-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-Isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-(4-{7-[2-(4-Chloro-phenyl)-1,1-dimethyl-ethylamino]-1-isopropyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-(4-{1-Isopropyl-7-[(quinolin-3-ylmethyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

4-[1-Isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-1-methyl-piperazin-2-one;

1-{4-[1-Isobutyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-Isopropyl-7-((S)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-sec-Butyl-7-((S)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-((S)-sec-Butyl)-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

4-[1-sec-Butyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-1-methyl-piperazin-2-one;

1-{4-[1-((R)-sec-Butyl)-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-(1-Ethyl-propyl)-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-Ethyl-4-[1-isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-2-one;

1-{4-[1-(2-Methoxy-1-methyl-ethyl)-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-Cyclopentyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[7-((R)-1-Quinolin-3-yl-ethylamino)-1-(tetrahydro-pyran-4-ylmethyl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[7-((R)-1-Quinolin-3-yl-ethylamino)-1-(tetrahydro-pyran-4-yl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-Hexyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[7-{[1-(4-Chloro-phenyl)-cyclobutylmethyl]-amino}-1-(1-ethyl-propyl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[7-[1-(4-Ethoxy-phenyl)-ethylamino]-1-(1-ethyl-propyl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-[4-(1-sec-Butyl-7-{[1-(4-chloro-phenyl)-cyclobutylmethyl]-amino}-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-piperazin-1-yl]-ethanone;

1-{4-[1-Cyclobutylmethyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[7-[(S)-1-(4-Ethoxy-phenyl)-ethylamino]-1-(1-ethyl-propyl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-Dicyclopropylmethyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-(1-Ethyl-propyl)-7-((R)-1-quinolin-3-yl-propylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-(1-Ethyl-propyl)-7-((S)-1-quinolin-3-yl-propylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-Isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-propan-1-one;

1-{4-[1-sec-Butyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-propan-1-one;

1-{4-[7-(1-Benzofuran-5-yl-ethylamino)-1-(1-ethyl-propyl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-(1-Ethyl-propyl)-7-((R)-1-naphthalen-2-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

4-[1-Isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-2-one;

1-(4-{1-(1-Ethyl-propyl)-7-[1-(6-fluoro-quinolin-3-yl)-ethylamino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-{4-[1-sec-Butyl-7-((R)-1-quinolin-3-yl-propylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[7-[((R)-Cyclopropyl-quinolin-3-yl-methyl)-amino]-1-(1-ethyl-propyl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-(4-{1-sec-Butyl-7-[1-(2-methyl-benzofuran-5-yl)-ethylamino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin4.6-1-yl)-ethanone;

1-(4-{1-(1-Ethyl-propyl)-7-[1-(2-methyl-benzofuran-5-yl)-ethylamino]-1H-pyrazolo[4,3-cl]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-(4-{1-(1-Ethyl-propyl)-7-[1-(4-isopropoxy-phenyl)-ethylamino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-{4-[1-Cyclobutyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

4-[1-Cyclobutyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-1-methyl-piperazin-2-one;

1-{4-[1-Ethyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

4-[1-(1-Ethyl-propyl)-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazine-1-carboxylic acid amide;

1-(4-{1-sec-Butyl-7-[1-(6-phenyl-pyridin-3-yl)-ethylamino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-(4-{1-sec-Butyl-7-[1-(4-pyridin-2-yl-phenyl)-ethylamino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-(4-{1-(1-Ethyl-propyl)-7-[(R)-1-(6-fluoro-quinolin-3-yl)-ethylamino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-{4-[7-[1-(2-Cyclopropyl-benzofuran-5-yl)-ethylamino]-1-(1-ethyl-propyl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-(4-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-{4-[7-(1-Benzo[b]thiophen-5-yl-ethylamino)-1-(1-ethyl-propyl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-[4-(1-sec-Butyl-7-{[cyclopropyl-(6-phenyl-pyri din-3-yl)-methyl]-amino}-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-piperazin-1-yl]-ethanone;

4-{7-[((R)-Cyclopropyl-quinolin-3-yl-methyl)-amino]-1-isopropyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-1-methyl-piperazin-2-one;

1-{4-[1-(1,2-Dimethyl-propyl)-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-(4-{1-(1-Ethyl-propyl)-7-[(R)-1-(6-fluoro-quinolin-3-yl)-ethylamino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone

1-{4-[7-[((R)-Cyclopropyl-quinolin-3-yl-methyl)-amino]-1-(1,2-dimethyl-propyl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[7-{[Cyclopropyl-(6-cyclopropylmethoxy-pyridin-3-yl)-methyl]-amino}-1-(1-ethyl-propyl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

4-{1-(1-Ethyl-propyl)-7-[(quinolin-3-ylmethyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxylic acid amide;

1-{4-[7-{[Cyclopropyl-(6-fluoro-quinolin-3-yl)-methyl]-amino}-1-(1-ethyl-propyl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

4-{7-[((R)-Cyclopropyl-quinolin-3-yl-methyl)-amino]-1-isopropyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxylic acid amide;

4-{1-((S)-sec-Butyl)-7-[(cyclopropyl-imidazo[1,2-a]pyridin-6-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxylic acid amide;

4-{1-((S)-sec-Butyl)-7-[1-(6,7-difluoro-quinolin-3-yl)-ethylamino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxylic acid amide;

4-{1-((S)-sec-Butyl)-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxylic acid amide;

4-{1-((R)-sec-Butyl)-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxylic acid amide;

4-{1-((S)-sec-Butyl)-7-[1-(1H-indazol-3-yl)-ethylamino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxylic acid amide;

4-[7-[((R)-Cyclopropyl-quinolin-3-yl-methyl)-amino]-1-(tetrahydro-pyran-4-yl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazine-1-carboxylic acid amide;

4-[1-((S)-sec-Butyl)-7-(1-pyrazolo[1,5-a]pyridin-2-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazine-1-carboxylic acid amide;

((R)-Cyclopropyl-quinolin-3-yl-methyl)-[1-(1-ethyl-propyl)-5-[1,2,3]triazol-1-yl-1H-pyrazolo[4,3-d]pyrimidin-7-yl]-amine;

1-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperidine-4-carboxylic acid amide;

4-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-morpholine-2-carbonitrile;

1-{4-[1-sec-Butyl-3-methyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

(1-sec-Butyl-5-[1,2,4]triazol-1-yl-1H-pyrazolo[4,3-d]pyrimidin-7-yl)-((R)-cyclopropyl-quinolin-3-yl-methyl)-amine;

(1-sec-Butyl-5-tetrazol-1-yl-1H-pyrazolo[4,3-d]pyrimidin-7-yl)-((R)-cyclopropyl-quinolin-3-yl-methyl)-amine;

(1-sec-Butyl-5-tetrazol-2-yl-1H-pyrazolo[4,3-d]pyrimidin-7-yl)-((R)-cyclopropyl-quinolin-3-yl-methyl)-amine;

4-(1-((S)-sec-Butyl)-7-[cyclopropyl-(1-ethyl-1H-indazol-5-yl)-methyl]-amino-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-piperazine-1-carboxylic acid amide;

1-{4-[1-((S)-sec-Butyl)-7-(2-hydroxy-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[1-((S)-sec-Butyl)-7-(2-methoxy-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

4-{1-((S)-sec-Butyl)-7-[(cyclopropyl-quinoxalin-2-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxylic acid amide;

4-{1-sec-Butyl-7-[(R)-1-(7-methyl-imidazo[1,2-a]pyridin-2-yl)-ethylamino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxylic acid amide;

4-[1-sec-Butyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazine-1-carboxylic acid amide;

4-{1-(1-Cyclopropyl-ethyl)-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxylic acid amide;

1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidine-5-carboxylic acid amide;

1-{4-[1-sec-Butyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[3-Bromo-1-sec-butyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

5-(4-Acetyl-piperazin-1-yl)-1-sec-butyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidine-3-carbonitrile;

1-{4-[1-sec-Butyl-3-cyclopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[3-Bromo-2-isopropyl-7-(1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

5-(4-Acetyl-piperazin-1-yl)-2-isopropyl-7-(1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidine-3-carboxylic acid amide;

1-{4-[2-Isopropyl-3-methyl-7-(1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-(4-{3-Bromo-7-[2-(4-chloro-phenyl)-1,1-dimethyl-ethylamino]-2-isopropyl-2H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-{4-[3-Bromo-2-isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[3-Chloro-2-isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-{4-[3-Bromo-1-isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

1-(4-{7-[2-(4-Chloro-phenyl)-1,1-dimethyl-ethylamino]-2-isopropyl-3-methyl-2H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-ethanone;

1-{4-[2-Isopropyl-3-methyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

5-(4-Acetyl-piperazin-1-yl)-2-isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidine-3-carbonitrile;

5-(4-Acetyl-piperazin-1-yl)-1-isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidine-3-carbonitrile;

1-{4-[3-Bromo-2-sec-butyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

5-(4-Acetyl-piperazin-1-yl)-2-sec-butyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidine-3-carbonitrile;

1-{4-[3-Cyclopropyl-2-isopropyl-7-((R)-1-quinolin-3-yl-ethylamino)-2H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazin-1-yl}-ethanone;

4-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperaz4.53ine-1-sulfonic acid amide;

2-(4-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazin-1-yl)-acetamide;

4-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-N-cyanopiperazine-1-carboximidamide;

4-(1-sec-butyl-7-{[(R)-methyl(quinolin-3-yl)methyl]amino}-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-N-cyanopiperazine-1-carboximidamide;

4-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperazine-1-carboxamidine;

2-{4-[1-sec-Butyl-7-((R)-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-pyrazol-1-yl}-ethanol;

[1-sec-Butyl-5-(1-methyl-1H-pyrazol-4-yl)-1H-pyrazolo[4,3-d]pyrimidin-7-yl]-((R)-cyclopropyl-quinolin-3-yl-methyl)-amine;

[1-sec-Butyl-5-(1-ethyl-1H-pyrazol-4-yl)-1H-pyrazolo[4,3-d]pyrimidin-7-yl-]-((R)-cyclopropyl-quinolin-3-yl-methyl)-amine;

{1-sec-Butyl-5-[1-(2-fluoro-ethyl)-1H-pyrazol-4-yl]-1H-pyrazolo[4,3-d]pyrimidin-7-yl}-((R)-cyclopropyl-quinolin-3-yl-methyl)-amine;

(R)-Cyclopropyl-quinolin-3-yl-methyl)-[5-(1-methyl-1H-pyrazol-4-yl)-1-(tetrahydro-pyran-4-yl)-1H-pyrazolo[4,3-d]pyrimidin-7-yl]-amine;

4-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-piperidine-1-carboxylic acid amide;

[1-sec-Butyl-5-(1H-pyrazol-4-yl)-1H-pyrazolo[4,3-d]pyrimidin-7-yl]-((R)-cyclopropyl-quinolin-3-yl-methyl)-amine;

2-(4-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-pyrazol-1-yl)-acetamide;

2-(4-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-pyrazol-1-yl)-ethanol;

2-{1-((S)-sec-Butyl)-5-[1-(2-fluoro-ethyl)-1H-pyrazol-4-yl]-1H-pyrazolo[4,3-d]pyrimidin-7-ylamino}-2-quinolin-3-yl-ethanol;

{1-sec-Butyl-5-[1-(2-fluoro-ethyl)-1H-pyrazol-4-yl]-1H-pyrazolo[4,3-d]pyrimidin-7-yl}-[(R)-1-(7-methyl-imidazo[1,2-a]pyridin-2-yl)-ethyl]-amine;

4-[1-((S)-sec-Butyl)-7-(2-hydroxy-1-quinolin-3-yl-ethylamino)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-piperazine-1-carboxylic acid amide;

1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidine-5-carboxylic acid cyclopropylamide;

[1-sec-Butyl-5-(5-methyl-[1,3,4]oxadiazol-2-yl)-1H-pyrazolo[4,3-d]pyrimidin-7-yl]-((R)-cyclopropyl-quinolin-3-yl-methyl)-amine;

1-{1-sec-Butyl-7-[((R)-cyclopropyl-quinolin-3-yl-methyl)-amino]-1H-pyrazolo[4,3-d]pyrimidin-5-yl}-1H-[1,2,3]triazole-4-carboxylic acid amide; and

(1-sec-Butyl-5-pyridazin-3-yl-1H-pyrazolo[4,3-d]pyrimidin-7-yl)-((R)-cyclopropyl-quinolin-3-yl-methyl)-amine.

2. The method according to claim 1 , wherein said regulating comprises inhibition of one or both of the P2X 3 or P2X 2/3 receptors.