Patent ID: 7875728

Claim:
A pharmaceutical composition comprising a pharmaceutically acceptable excipient and a compound of formula (Ic): as a single tautomer, a mixture of tautomers, a single stereoisomer, a mixture of stereoisomers, or a racemic mixture; or a pharmaceutically acceptable salt thereof; wherein: R 1c is hydrogen, alkyl, aryl or aralkyl; R 2c is aryl optionally substituted with one or more substituents selected from the group consisting of fluoro, —R 6c —N(R 8c ) 2 , —S(O) 2 —R 6c —OH, —S(O) 2 —N(R 7c )R 8c and heterocyclylalkyl; R 4c is hydrogen or alkyl; R 3c is hydrogen, alkyl, heterocyclylalkyl, or heterocyclylcarbonyl; R 5c is alkyl, alkenyl, cycloalkyl (optionally substituted by one or more substituents selected from the group consisting of alkyl and aryl); each R 6c is independently a straight or branched alkylene chain; each R 7c is independently hydrogen, alkyl, aryl, aralkyl or heterocyclylalkyl; R 8c is hydrogen, alkyl, aryl aralkyl or hydroxyalkyl, provided that when R 1c , R 3c and R 4c are all hydrogen and R 5c is methyl, R 2c can not be phenyl optionally substituted with one or more substituents selected from the group consisting of chloro, bromo or alkyl.