Patent ID: 7402678

Claim:
A compound of the formula: (A-) y -Q wherein each A is independently selected from a functional group of Formula (III): wherein: each R 6 is independently an alkyl, fluoroalkyl, chloroalkyl, aryl, —NR c R d wherein R c and R d are each an alkyl group or taken together with the nitrogen atom to which they are attached form a four to eight membered cyclic group, or R 6 taken together with R e and the groups to which they are attached form the four to eight membered heterocyclic or heterobicyclic group that can be fused to the optional aromatic group, optional saturated or unsaturated cyclic group, or optional saturated or unsaturated bicyclic group; each Z is independently an alkyl, aryl, or —(CO)R e wherein R e together with R 6 and groups to which they are attached form a four to eight membered heterocyclic or heterobicyclic group having a nitrogen heteroatom and a sulfur heteroatom, wherein said heterocyclic or heterobicyclic group can be fused to an optional aromatic group, optional saturated or unsaturated cyclic group, or optional saturated or unsaturated bicyclic group; each Y 3 is independently a single bond or a divalent group selected from the group consisting of an alkylene, heteroalkylene, arylene, heteroarylene, carbonyl, carbonyloxy, carbonylimino, oxy, thio, —NR f — where R f is hydrogen or alkyl, and combinations thereof; Q is a single bond or an y-valent atom or group; and y is an integer of 2 to 10; with the proviso that Q, and Y 3 are free of disulfide groups.