Patent ID: 7863048

Claim:
A compound of the formula: wherein: R 1 , R 3 , and R 4 are all H; R 5 is OH; R 2 is NR 22 R 23 wherein R 22 and R 23 are C 1 -C 10 alkyl, or R 22 and R 23 are combined to form a single C 4 -C 8 alkyl group such that R 2 is a N-containing heterocycle; R 6 and R 7 are H; n is 1; and Q is where * denotes the site of attachment, R 8 is CR 82 R 83 wherein R 82 is CH 3 and R 83 is a member selected from the group consisting of CH 3 and (CH 2 ) 3 â€”C(ËœO)â€”NHâ€”(CH 2 ) 3 â€”SO 3 âˆ’ , R 9 , R 11 , and R 12 are H, R 10 is SO 3 âˆ’ , and R 13 is C 1 -C 20 alkyl substituted with SO 3 âˆ’ .