The molecule is an organosulfonate oxoanion obtained by deprotonation of the sulfo groups of 5-acetamido-4-hydroxy-3-(phenyldiazenyl)naphthalene-2,7-disulfonic acid. It is a conjugate base of a 5-acetamido-4-hydroxy-3-(phenyldiazenyl)naphthalene-2,7-disulfonic acid.
5-acetamido-4-hydroxy-3-phenyldiazenylnaphthalene-2,7-disulfonate