Patent ID: 8338432

Claim:
A compound of formula (I): or pharmaceutically acceptable salts thereof; wherein: R 1 is an aromatic group, optionally condensed, optionally substituted with R B in one or more positions; a heteroaromatic group containing one or more heteroatoms, optionally substituted with R B or an indole group in one or more positions; a C 2-6 alkenylcarbonyl, optionally substituted with R B in one or more positions; a bicyclic aromatic, optionally substituted with R B in one or more positions, or a bicyclic heteroaromatic containing one or more heteroatoms, optionally substituted with R B in one or more positions; R B is a halogen, hydroxy, nitrogen, cyano, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 3-8 cycloalkyl, C 3-8 cycloalkylC 1-3 alkyl, arylC 1-3 alkyl or heteroarylC 1-3 alkyl; R 2 is an aromatic group containing one or more heteroatoms, a heteroaromatic containing group containing one or more heteroatoms or methylene-3,4-dioxyphenyl groups, or a bicyclic aromatic containing one or more heteroatoms or methylene-3,4-dioxyphenyl groups; R 3 is hydrogen, halogen, C 1-6 haloalkyl, C 1-3 heteroalkyl, or C 1-3 alkyl; and R 4 is hydrogen, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 3-8 cycloalkyl, C 3-8 cycloalkylC 1-3 alkyl, arylC 1-3 alkyl or heteroarylC 1-3 alkyl.