Patent ID: 7763602

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof wherein, R 1 is C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 1 -C 4 thioalkoxy, trifluoroalkyl, trifluoroalkoxy or, hydroxyalkyl; R 2 is selected from a group consisting of i) phenyl which is unsubstituted or substituted with 1 or 2 substituents, each independently selected from the group consisting of halogen, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 1 -C 4 thioalkoxy, nitro, haloalkyl, haloalkoxy, piperazine, morpholine, thiomorpholine, pyrrolidine, and piperidine, or ii) naphthalene; R 3 is phenyl substituted with 1 to 3 substituents selected from SH, NO 2 , CH 2 Cl, CH 2 Br, OCF 3 , OCH 2 CF 3 , Cl, Br, I, F, C 1 to C 6 alkoxy, C 1 to C 6 alkyl, C 1 to C 6 thioalkyl, C 6 to C 10 aryl, C 5 to C 6 heteroaryl with 1 to 3 heteroatoms selected from O, N and S; R4 and R5 are selected from H or —(CH2)n-R7 and when one of R 4 and R 5 is H, the other is —(CH 2 ) n —R 7 wherein n=1-3 and R 7 is selected from the groups wherein R 8 is phenyl which is unsubstituted or substituted with 1-2 substituents each independently selected from the group consisting of halogen, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 1 -C 4 thioalkoxy, nitro, amino, haloalkyl, haloalkoxy; benzyl or benzyl substituted with 3,4-methylenedioxy; heteroaryl; heteroaroyl; diphenylmethyl, m=0-2 and X=—NCH 3 , CH 2 , S, SO, or SO 2 and such that when R2 is unsubstituted or substituted phenyl, R7 is wherein R 8 is as defined above.