The molecule is an organosulfonate oxoanion obtained by deprotonation of the sulfo and hydroxyimino groups of 5-(hydroxyimino)-6-oxo-5,6-dihydronaphthalene-2-sulfonic acid. It is a conjugate base of a 5-(hydroxyimino)-6-oxo-5,6-dihydronaphthalene-2-sulfonic acid.
5-nitroso-6-oxidonaphthalene-2-sulfonate