Patent ID: 7763642

Claim:
A compound of Formula I wherein X and Z are each independently of each other an optional linker group selected from an alkyl group, an alkenyl group, an alkynl group, an aryl group, an alkoxy group, and oxyalkenyl group, an oxyalkynyl group, and oxyaryl group, COO, CO, S, o, SO, SO 2 , NR, and SO 2 NR, wherein R is selected from H, an alkyl group, an alkenyl group, an alkynyl group, an aryl group; Y is a linker group selected from an alkyl group, an alkenyl group, an alkynl group, and CO; R 1 is an optionally substituted 5- or 6-membered heterocyclic group containing 1 to 3 hetero atoms each selected from N, O and S; R 2 is selected from any one of an alkyl group, an alkenyl group, an alkynyl group, an aryl group, cyano (—CN), nitro (—NO 2 ) and halogens; R 3 and R 4 are independently selected from H and an alkyl group, an alkenyl group, an alkynyl group, or an aryl group; ring A and B are independently optionally further substituted by groups selected from —CH 3 , —CH 2 CH 3 , —OCH 3 , cyano (—CN), nitro (—NO 2 ) and halogens.