Patent ID: 7442558

Claim:
A compound having a structure according to Formula I: wherein, R 1 , R 2 , R 4 , R 5 , R 6 , R 7 , R 10 and R 20 are members independently selected from the group consisting of H, alkyl and substituted alkyl groups, wherein, two or more of R 2 , R 4 , R 5 , R 7 and, when R 3 is substituted alkyl, a substituent of R 3 are optionally adjoined by at least one linker moiety to form at least one ring; R 3 , R 8 and R 9 are members independently selected from the group consisting of alkyl, substituted alkyl, aryl and substituted aryl groups; R 11 , R 12 , R 13 , R 21 , R 22 and R 23 are members independently selected from alkyl, substituted alkyl, H, —NR 14 R 15 , —NO 2 , —OR 16 , —COO 17 , wherein R 14 , R 15 , R 16 , and R 17 are members independently selected from the group consisting of H, alkyl, and substituted alkyl, wherein R 12 can optionally form a ring with R 11 , R 13 , or both, and R 22 can optionally form a ring with R 21 , R 23 , or both, said rings being members independently selected from the group of ring systems consisting of cyclic alkyl, substituted cyclic alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclyl and substituted heterocyclyl ring systems; and Q 1 is —OR 18 ; Q 2 is —OR 19 ; wherein R 18 and R 19 are members independently selected from H, an enzymatically labile group, a hydrolytically labile group and a single negative charge; a is 0 or 1, with a proviso that when a is 0, N 2′ is covalently attached directly to carbonyl group 2′; and z is 0 or 1, with a proviso that when z is 0, N 1′ is covalently attached directly to carbonyl group 1′ wherein said compound is covalently attached to a member selected from a receptor and a drug.