Patent ID: 7956169

Claim:
A compound represented by Formula 4: wherein: each of R 1 , R 2 , R 3 and R 4 is independently hydrogen, halogen, NO 2 , SO 3 R, SO 2 N(R) 2 , CN, CNS, (C 1 -C 10 )alkoxy, C 1 -C 10 alkyl, aryl, or heteroaryl; or R 1 and R 2 together or R 3 and R 4 together form a five- or six-membered ring, wherein said five- or six-membered ring is optionally substituted with halogen, NO 2 , SO 3 R, SO 2 N(R) 2 , CN, CNS, keto, (C 1 -C 10 )alkoxy, C 1 -C 10 alkyl, aryl, or heteroaryl; R is H or C 1 -C 10 alkyl; X is a C 1 -C 100 straight or branched alkyl linking group, wherein one or more carbon atoms is optionally replaced with a nitrogen, oxygen or sulfur atom, or a combination thereof; and Y is controlled pore glass (CPG), polystyrene or wherein each of R a and R b is straight or branched C 1 -C 10 alkyl; and R c is straight or branched C 1 -C 10 alkyl or cyanoethyl.