Patent ID: 6864103

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, substituted alkyl, and polyether, wherein, two or more of R 1 , R 2 , R 4 , R 5 , R 6 , and R 7 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, substituted aryl, and polyether; 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 , —COOR 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, and 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 the proviso that when a is 0, N 2′ is covalently attached directly to carbonyl group 2′, z is 0 or 1, with the proviso that when z is 0, N 1′ is covalently attached directly to carbonyl group 1′.