The molecule is an organosulfonate oxoanion obtained by deprotonation of the sulfo group of 3-[(4-anilinophenyl)diazenyl]benzene-1-sulfonic acid. It is a conjugate base of a 3-[(4-anilinophenyl)diazenyl]benzene-1-sulfonic acid.
3-[(4-anilinophenyl)diazenyl]benzenesulfonate