Patent ID: 8916575

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt wherein R 1 is one of the following: R 2 is hydrogen, halogen, hydroxyl, amine, C 1-7 alkyl, C 1-7 alkylamino, C 1-6 alkoxy, or (C 1-4 )alkoxy-(C 1-4 )alkyl, R 3 is hydrogen, halogen, hydroxyl, amine, C 1-7 alkyl, C 1-7 alkenyl, C 1-7 alkynyl, C 1-7 alkylamino, C 1-6 alkoxy, or (C 1-4 )alkoxy-(C 1-4 )alkyl, R 4 is hydrogen, halogen, hydroxyl, amine, C 1-7 alkyl, C 1-7 alkylamino, C 1-6 alkoxy, or (C 1-4 )alkoxy-(C 1-4 )alkyl, and R 5 is hydrogen, fluorine, chlorine or methyl with the proviso that R 2 , R 3 , R 4 , and R 5 cannot all be H.