Patent ID: 7588754

Claim:
A polymer comprising a recurring unit of the formula (I): wherein: X 1 and X 2 are each independently selected from the group consisting of single bond, —O—, —NR 1 —, and —(CH 2 ) c —CR 1 R 2 —; Y is selected from the group consisting of N, C 1 to C 20 alkyl and C 6 -C 20 aryl; Z is selected from the group consisting of —(CH 2 ) m —C(═O)OR 3 , —(CH 2 ) m —C(═O)SR 3 , —(CH 2 ) m —C(═O)NR 3 R 4 , —(CH 2 ) m —NR 3 R 4 , —(CH 2 ) m —NH—C(═O)—R 3 , —NH—C(═O)—(CH 2 ) m —C(═O)—NR 3 R 4 , —NH—C(═O)—(CH 2 ) m —C(═O)—OA, —(CH 2 ) m —NHR 5 , —NH—C(═O)—(CH 2 ) m —W, and —NH—C(═O)—(CH 2 ) m -Het; R 1 , R 2 and R 5 are each independently selected from the group consisting of hydrogen, C 1 to C 20 alkyl, and C 6 -C 20 aryl; R 3 and R 4 are each independently selected from the group consisting of W, hydrogen, C 1 to C 20 alkyl, and C 6 -C 20 aryl; Het represents a heterocyclic ring; W is an imaging agent; A is selected from the group consisting of succinimyl, H, and alkali metal; a, b, c, and m are each independently zero or an integer in the range of 1 to 3; and n is an integer in the range of about 3 to about 10,000.