Patent ID: 7659305

Claim:
A compound of formula (Ib): wherein R a is selected from halogen, hydroxy, cyano, nitro, amino, hydroxycarbonyl, C 1 -C 6 alkyl, C 1 -C 6 alkenyl, C 1 -C 6 alkynyl, hydroxyC 1 -C 6 alkyl, C 1 -C 6 alkoxyC 1 -C 6 alkyl, perfluoroC 1 -C 6 alkoxy, C 1 -C 6 alkylamino, di-C 1 -C 6 alkylamino, aminoC 1 -C 6 alkyl, C 1 -C 6 alkylaminoC 1 -C 6 alkyl, di-C 1 -C 6 alkylaminoC 1 -C 6 alkyl, and C 1 C 6 alkylthio; R b is selected from hydrogen, halogen, hydroxy, (C 1 -C 6 )alkoxy cyano, nitro, amino, hydroxycarbonyl, C 1 -C 6 alkyl, C 1 -C 6 alkenyl, C 1 -C 6 alkynyl, C 1 -C 6 alkoxy, hydroxyC 1 -C 6 alkyl, C 1 C 6 alkoxyC 1 -C 6 alkyl, perfluoro C 1 -C 6 alkyl, perfluoroC 1 -C 6 alkoxy, C 1 -C 6 alkylamino, di-C 1 C 6 alkylamino, aminoC 1 -C 6 alkyl, C 1 -C 6 alkylaminoC 1 -C 6 alkyl, di-C 1 -C 6 alkylaminoC 1 -C 6 alkyl, and C 1 -C 6 alkylthio; or a pharmaceutically acceptable salt thereof.