Process
The present invention relates to a process for the preparation of S-[2-[1-(2-ethylbutyl)cyclohexylcarbonylamino]-phenyl]2-methylthiopropionate which is useful as a pharmaceutically active compound.
1. A compound of formula (X):
2. A pharmaceutical composition comprising a compound of formula (I):
and a compound of formula (X):
wherein said composition has less than 0.1% of the compound of formula (X) by weight.
3. A pharmaceutical composition according to claim 2 wherein said composition has between 1 ppb and 100 ppm of the compound of formula (X).
4. A pharmaceutical composition comprising a compound of formula (I):
a compound of formula (X):
and a compound of formula (V):
having less than 0.1% of the compound of formula (X) by weight and less than 0.1% of the compound of formula (V) by weight.
5. The pharmaceutical composition of claim 4 , having between 1 ppb and 100 ppm of the compound of formula (X) and between 1 ppb and 100 ppm of the compound of formula (V).
6. A pharmaceutical composition comprising S-[2-([[1-(2-ethylbutyl)-cyclohexyl]-carbonyl]amino)phenyl]-methylpropanethioate and a compound of formula (X)
7. The pharmaceutical composition according to claim 6 , wherein the composition comprises between 1 ppb and 100 ppm of the compound of formula (X).