Patent ID: 7087634

Claim:
A compound having the formula: wherein R 1 is optionally substituted phenyl; R 2 is selected from the group consisting of optionally substituted C 3-16 alkyl, aryl, alkoxyalkyl, aryloxyalkyl, aralkoxyalkyl, (alkylthio) alkyl, (arylthio) alkyl, and (aralkylthio) alkyl; R 3 is selected from the group consisting of alkyl, haloalkyl, and aryl; R 4 is alkyl; with the proviso that when R 1 is unsubstituted phenyl, R 2 is different from unsubstituted phenyl, unsubstituted pyridinyl, and p-tolyl, and when R 4 is methyl, R 3 is different from methyl, ethyl, and phenyl.