Patent ID: 6949537

Claim:
A compound of the formula: wherein, Ring A is benzo; Z 1 and Z 2 are O; R 1 and R 2 independently are H, optionally substituted aliphatic, optionally substituted aryl, hydroxyl, halogen, alkoxy, heterocycle, cyano, amino, or, are taken together to form an optionally substituted cycloaliphatic or optionally substituted aryl; R 3 represents H, optionally substituted aliphatic, and optionally substituted aryl; R 4 and R 5 independently are H, optionally substituted aliphatic, optionally substituted aryl, heterocycle, aryloxy, carboxy, or, are taken together to form an optionally substituted heterocycle or optionally substituted heteroaryl; R 6 represents H, optionally substituted aliphatic, optionally substituted aryl, alkoxy, carboxy, amino, heterocycle, aryloxy, and optionally substituted therewith a targeting agent; L represents a linker group; and the bond between N + and L is hydrolyzable.