Patent ID: 7713452

Claim:
A compound having one of the following formulae: wherein: —Z 1 is —OH, —SH, a primary or secondary amine; Y is an aromatic, carbocyclic or heterocyclic moiety substituted at least once with OH and optionally substituted with SH, primary, secondary or tertiary amine, nitro, nitroso, halogen, a substituted or unsubstituted, straight or branched C 1-22 alkyl, C 2-22 alkene, C 2-22 alkyne, phenyl, C 3-6 cycloalkyl; R 22 , R 23 , R 12 and R 13 are independently a substituted or unsubstituted, straight or branched C 1-22 alkyl, C 2-22 alkene, C 2-22 alkyne, phenyl, C 3-6 cycloalkyl, or at least one of the pairs R 22 and R 23 or R 12 and R 13 forms an aromatic or non-aromatic 1 to 3 ring cyclic moiety; R 2 and R 3 are independently a substituted or unsubstituted, straight or branched C 1-22 alkyl, C 2-22 alkene, C 2-22 alkyne, phenyl, C 3-6 cycloalkyl, or together form an aromatic or non-aromatic 1 to 3 ring cyclic structure.