Patent ID: 6858621

Claim:
A compound of the formula (1a) wherein R 1 is hydrogen; R 2 is hydrogen; R 3 is halogenated lower alkyl; R 3a is absent or hydroxy; represents an optional double bond; such that when R 3a is absent, the double bond extends from the carbon atom of the ring bound to R 2 to the carbon atom of the ring bound to R 3 ; R 4 and R 5 are taken together with the carbon atoms to which they are bound to form a six membered, heterocyclyl group containing two heteroatoms selected from the group consisting of O, N and S; wherein the heterocyclyl group is optionally substituted with one to four substituents independently selected from halogen or oxo; provided that when the substituent is oxo, then the substituent is bound to a S atom of the heterocyclyl group; R 6 is hydrogen; R 7 is selected from the group consisting of hydrogen and lower alkyl; or a pharmaceutically acceptable salt, esteror prodrug thereof.