Patent ID: 8084641

Claim:
A compound according to the structure: Where Y is O or S; Z is N; n is 0-6; R 1 and R 2 are independently H, or a C 1 -C 10 hydrocarbyl group optionally substituted with an electron, withdrawing group or a C 1 -C 6 alkyl group or a O—(C 1 -C 6 ) alkoxy group; R 3 is H, halogen, CN, NO 2 , a CO 2 R group, wherein R is an aromatic group which is optionally substituted with an electron withdrawing group or a C 1 -C 6 alkyl group or a O—(C 1 -C 6 ) alkoxy group, or C 1 -C 6 alkyl group which is optionally substituted with an electron withdrawing group or a C 1 -C 6 alkyl group or a O—(C 1 -C 6 ) alkoxy group; Ar is an aromatic group which is optionally substituted with an electron withdrawing group or a C 1 -C 6 alkoxy group or O—(C 1 -C 6 ) alkoxy group; X is an aromatic group which is optionally substituted with an electron withdrawing group or a C 1 -C 6 alkyl group, OR 4 or N(R 4 ) 2 , where each R 4 is independently C 1 -C 6 alkyl group which is optionally substituted with an electron withdrawing group or a C 1 -C 6 alkyl group, C 3 -C 7 carbocyclic group which is optionally substituted with an electron withdrawing group or a C 1 -C 6 alkyl group or a O—(C 1 -C 6 ) alkoxy group, or an aromatic group which is optionally substituted with an electron withdrawing group or a C 1 -C 6 alkyl group or a O—(C 1 -C 6 ) alkoxy group, or a salt thereof.