Patent ID: 8258324

Claim:
A compound of the following structure: wherein: X is selected from the group consisting of alkylene, substituted alkylene, alkenylene, substituted alkenylene, —C(O)—, heteroatom and substituted heteroatom; each of R 1 , R 2 , R 3 and R 4 is independently selected from the group consisting of H, halo, hydroxyl, carboxyl, carboxylalkyl, thiol, alkylthio, acyl, acyloxy, nitro, cyano, azido, trihalomethyl, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, alkoxy, aryl, substituted aryl, heterocycle, substituted heterocycle, heteroaryl, and substituted heteroaryl; and n′ is 2 to about 10.