Patent ID: 7410998

Claim:
A compound represented by the following structure: wherein: A is a π-bond that is either present or absent; R 1 and R 2 are radicals independently selected from the group consisting of —H, —F, —Cl, and —Br; R 3 and R 4 are —H; R 5 , R 6 and R 7 are radicals independently selected from the group consisting of —H, —OMe, —F, —Cl, and —Br; Z is —(CH2)—; X is carbon; Y is a diradical or pair of radicals selected from the group consisting of ═O, ═S, ═CH 2 , ═CF 2 , ═NOH, ═NOMe, and ═NOBn; and n is 0.