Patent ID: 7297548

Claim:
A compound of the formula: wherein: at least one of R1 and R2 is a linker arm, and the other is independently selected from the group consisting of linker arms and non-linker substituents; where the linker arm is a saturated or unsaturated, substituted or unsubstituted, hydrocarbon of about C 30 or fewer, and is covalently bonded to a solid substrate; where the non-linker substituent is hydrogen, or a saturated or unsaturated, substituted or unsubstituted, hydrocarbon of about C 20 or fewer; R3 is selected from the group consisting of halogen, acyl, alkyloxy, nitro, carboxylic acid, and carboxylic acid ester, and R4, R5, R6, and R7 are the same or different, and are selected from the group consisting of hydrogen, alkyl, alkenyl, aryl, arylalkyl, substituted alkyl, acyl, alkyloxy, and halogen.