Patent ID: 7563891

Claim:
A compound having a formula selected from the group consisting of: where R 10 , R 11 and R 12 are independently C 1 to C 6 alkyl or —(CH 2 ) 5 CO 2 H; D is N; r is an integer of 1 to 3 and s is an integer of 2 to 5: and where Y is where n is an integer of 1 to 6; A′-CO—R 1 , where A′ is —R 2 O— or —R 2 N(R 3 )—, 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.