Patent ID: 7691837

Claim:
A compound of formula (I), and pharmaceutically acceptable salts 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 pyridine or NHCOR 6 , wherein R 6 is pyridyl; R 3 is phenyl or substituted phenyl; R 4 and R 5 are H or —(CH 2 ) n —R 7 ; 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 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 ; further wherein: when R 2 is pyridine, R 7 is: wherein R 8 is as defined above.