Patent ID: 7560572

Claim:
A compound having the structure: wherein, R 1 is a member selected from hydrogen, —OH, and (═O); R 2 is an alkyl group terminally substituted with a reactive functional group wherein the reactive functional group is a member selected from —OR 3 , —NHR 4 , —COR 5 , —SH and —CH 2 X 3 wherein, —OR 3 is a member selected from hydroxyl, alkyl sulfonate, and aryl sulfonate; R 4 is a member selected from hydrogen, C 1 -C 6 alkyl, C 1 -C 6 substituted alkyl, aryl and substituted aryl groups; R 5 is a member selected from hydrogen, X 3 and —OR 6 , wherein R 6 is a member selected from hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclyl and substituted heterocyclyl groups; and X 3 is a halogen; X is —NH—; and X 1 and X 2 are members independently selected from O and S.