Patent ID: 7358396

Claim:
A compound of the formula IX wherein, R 1 is substituted or unsubstituted, branched or unbranched C 1 -C 10 -alkyl, C 2 -C 10 -alkenyl, C 2 -C 10 -alkynyl, arylalkyl, aryl, hetarylalkyl or hetaryl, R 2 is substituted or unsubstituted, branched or unbranched C 1 -C 10 -alkyl, C 3 -C 10 -alkenyl, C 3 -C 10 -alkynyl, arylalkyl, aryl, hetarylalkyl or hetaryl, R 3 is hydrogen, hydroxyl, substituted or unsubstituted, branched or unbranched C 1 -C 10 -alkyl, C 3 -C 10 -alkenyl or C 3 -C 10 -alkynyl, R 5 is hydrogen, substituted or unsubstituted, branched or unbranched C 1 -C 10 -alkyl, R 6 is hydrogen, substituted or unsubstituted, branched or unbranched C 1 -C 10 -alkyl or substituted or unsubstituted phenyl. X=oxygen or nitrogen, n=0 or 1.