Patent ID: 7671059

Claim:
A compound of formula (I): or a stereoisomer, tautomer, pharmaceutically acceptable salt, or prodrug thereof, wherein R a is selected from the group consisting of (1) hydrogen, (2) halogen, (3) hydroxyl, (4) C 1 -C 6 alkoxy, (5) thiol, (6) C 1 -C 6 alkyithiol, (7) substituted or unsubstituted C 1 -C 6 alkyl, (8) amino or substituted amino, (9) substituted or unsubstituted aryl, (10) substituted or unsubstituted heteroaryl, and (11) substituted or unsubstituted heterocyclyl; R is selected from the group consisting of (1) hydrogen, (2) substituted or unsubstituted C 1 -C 6 alkyl, (3) substituted or unsubstituted C 2 -C 6 alkenyl, (4) substituted or unsubstituted C 2 -C 6 alkynyl, (5) substituted or unsubstituted C 3 -C 7 cycloalkyl, (6) substituted or unsubstituted C 5 -C 7 cycloalkenyl, (7) substituted or unsubstituted aryl, (8) substituted or unsubstituted heteroaryl, and (9) substituted or unsubstituted heterocyclyl; R b is selected from the group consisting of (1) substituted or unsubstituted C 3 -C 7 cycloalkyl, (2) substituted or unsubstituted C 5 -C 7 cycloalkenyl, (3) substituted or unsubstituted aryl, (4) substituted or unsubstituted heteroaryl, and (5) substituted or unsubstituted heterocyclyl; and with the proviso that when R a is amino, then R b is not phenyl, 4-alkyl-phenyl, 4-alkoxy-phenyl, or 4-halo-phenyl.