4-amino-5-hydroxy-3-[(p-nitrophenyl)azo]-6-(phenylazo)-naphthalene-2,7-disulfonate
4-amino-5-hydroxy-3-[(p-nitrophenyl)azo]-6-(phenylazo)-naphthalene-2,7-disulfonate
An organosulfonate oxoanion resulting from the removal of a proton from both of the sulfonic acid groups of Amido Black 10B (acid form).