Patent ID: 7527733

Claim:
An apparatus comprising a resin attached to a compound comprising wherein R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are selected from the group consisting of hydrogen, alkyl, aryl, substituted alkyl, and substituted aryl; at least one of R 1 and R 2 is not hydrogen; at least one of R 5 and R 6 is not hydrogen; X 1 and X 2 are each independently selected from the group consisting of O, NR 7 , and S, wherein R 7 is hydrogen, alkyl, aryl, substituted alkyl, or substituted aryl; and Y is a linking group selected from the group consisting of: alkylene, substituted alkylene, alkylidene, substituted alkylidene, arylene, or substituted arylene; and wherein Y additionally comprises a substituent that binds to the resin.