Patent ID: 8450374

Claim:
A compound of the formula: wherein R 1 is phenyl phenoxy, benzoyl, phenylthio or benzyl, said R 1 being substituted with alkyl, branched alkyl, alkoxy, branched alkoxy, aryl, aryloxy, alkylamido, alkylcarbamoyl, or acyl; said provided that, when R 1 is substituted with alkyl or branched alkyl, the alkyl or branched alkyl is further substituted with amino, alkylamino, dialkylamino, arylamino, acyl, ester, carboxyl, hydroxyl, alkoxy, sulfonyl or cyano; further provided that, when R 1 is substituted with alkoxy, branched alkoxy, aryl, aryloxy, alkylamido, alkylcarbamoyl, or acyl, the alkoxy, branched alkoxy, aryl, aryloxy, alkylamido, alkylcarbamoyl, or acyl is further optionally substituted with alkyl, amino, alkylamino, dialkylamino, arylamino, acyl, ester, carboxyl, hydroxyl, alkoxy, sulfonyl or cyano.