Patent ID: 6890947

Claim:
A compound of formula wherein R 1 is aryl or heteroaryl; R 2 is hydrogen, alkyl or cycloalkyl; R 3 is aryloxy, alkenyloxy, alkoxy or alkoxy substituted with one to three halogen atoms; R 4 is hydrogen, alkyl or cycloalkyl; wherein any one of R 5 and R 6 is and the other is hydrogen, alkyl or cycloalkyl and, wherein the bond between the carbon atoms C a and C b is a carbon carbon single or double bond; R 7 is hydrogen, alkyl or cycloalkyl; R 8 is hydrogen, alkyl or cycloalkyl; wherein any one of A and A 1 is nitrogen and the other is oxygen or sulfur; n is 1, 2 or 3; or a pharmaceutically acceptable salt or ester thereof.