Patent ID: 7414154

Claim:
A compound of Formula I: wherein: each Z is independently a member selected from the group consisting of: X is a member selected from the group consisting of D and —R 2 -D; Y is a member selected from the group consisting of H, alkyl, and R 3 -D; D is a member selected from the group consisting of —OH, —SH, —SR 4 , and —N 4 R 5 ; each R 2 , R 3 , R 6 , and R 7 is independently C 1-6 alkylene; R 4 is a member selected from the group consisting of H and lower alkyl; R 5 is a member selected from the group consisting of H, lower alkyl, and —R 6 -D; Q is a member selected from the group consisting of H, lower alkyl, and —R 7 —SR 4 ; and k is an integer from 2 to about 16; stereoisomers, prodrugs, pharmaceutically acceptable salts, monoprotonated acid salts, or polyprotonated acid salts thereof.