Patent ID: 8071794

Claim:
A compound having the formula selected from the group consisting of where R 10 , R 11 and R 12 are independently C 1 to C 6 alkyl or â€”(CH 2 ) s CO 2 H where s is an integer of 2 to 5, Z is S, O, or â€”C(CH 3 ) 2 and r is an integer of 1 to 3, W is H, CH 3 , â€”SO 3 H, fused benzene or fused sulfobenzene, and D is CH, and where Y is where n is an integer of 1 to 6; Aâ€²-COâ€”R 1 , where Aâ€² is â€”R 2 Oâ€” or â€”R 2 N(R 3 )â€”, where R 2 is a C 1 to C 6 alkyl, R 3 is H or CH 3 , and R 1 is CH 2 Cl, CH 2 Br, CH 2 I; or where m is an integer of 2 to 6.