Patent ID: 8445734

Claim:
A compound having the following general formula: wherein R 1 is selected from the group consisting of H, NO 2 , CN, OCH 3 , a halogen, an alkyl group having up to 4 carbon atoms and an alkoxyl group having up to 4 carbon atoms, and R 2 is selected from the group consisting of an optionally substituted aryl group, an optionally substituted heteroaryl group and an optionally substituted aroyl group; and wherein R 3 is selected from the group consisting of H, NO 2 and halogen; and R 4 is selected from the group consisting of H, OCH 3 and an alkyl group having up to 4 carbon atoms, wherein the optionally substituted aryl group, optionally substituted heteroaryl group and optionally substituted aroyl group may be substituted with 1 to 3 substituents selected from the group consisting of an alkyl group, an alkoxyl group, a halogen atom, a hydroxyl group, an amino group, an acyl group, a nitro group, a cyano group, and a thioalkyl group.