Patent ID: 7169776

Claim:
A compound having the formula wherein R 1 , R 2 , R 3 , and R 4 are independently hydrogen; halogen; C 1 –C 4 alkoxy, optionally substituted with —OH or F; —OH; C 1 –C 4 alkyl, optionally substituted with —OH or F; —COOH; —OC(O)CH 3 ; —SO 3 H; nitrile; or —NR 9 R 10 ; R 5 a protecting group; R 6 is an activating group; or R 5 and R 6 are combined to form a substituted or unsubstituted cyclic group; R 7 is a linear or branched, C 1 –C 20 alkylene, alkenylene, or alkynylene; R 7 is optionally substituted with C 1 –C 4 alkyl, C 1 –C 4 alkenyl, oxygen, nitrogen, sulfur, halogen, —OH, C 1 –C 4 alkoxy, aryl, heteraryl, or vinyl; R 7 is optionally interrupted with aryl, heteroaryl, vinyl, oxygen, nitrogen, or sulfur; R 8 and R 11 are independently C 1 –C 4 alkyl or C 1 –C 4 haloalkyl; and R 9 and R 10 are independently hydrogen, C 1 –C 4 alkyl, or oxygen, and wherein both carboxylate groups attached to R 7 in the formula above are attached to the end of the alkylene, alkenylene. or alkynylene R 7 chain.