Patent ID: 7667046

Claim:
A compound according to Formula IIa: wherein R 3 is an alkyl, aryl, aralkyl, or —NR b R c wherein R b and R c are each an alkyl group or taken together with the nitrogen atom to which they are attached form a four to eight membered heterocyclic group; R 4 and R 5 together with a dicarboximide group to which they are attached form a four to eight membered heterocyclic or heterobicyclic group that can be fused to an optional aromatic group, optional saturated or unsaturated cyclic group, or optional saturated or unsaturated bicyclic group; Y 4 is a single bond or a divalent group selected from an alkylene, heteroalkylene, arylene, carbonyl, carbonyloxy, carbonylimino, oxy, thio, —NR a —, or combinations thereof, wherein R a is hydrogen, alkyl, or aryl; L 2 is an oxy, —C(R a ) 2 —, or —NR a — where R a is hydrogen, alkyl, or aryl; R 8 is hydrogen, alkyl, or aryl; and said compound is unsubstituted or substituted with a halo, alkyl, alkoxy, or combinations thereof.