1-HYDROXY-5-SULFONATONAPHTHALENE-2-DIAZONIUM, 1,2-Naphthochinon-2-diazid-5-sulfonsaeure, 1-Hydroxy-5-sulfo-naphthalin-2-diazonium-betain, 2-Diazo-naphthol-(1)-sulfonsaeure-(5), 5-Sulfo-2-diazo-1-naphthol, 1-hydroxy-5-sulfo-naphthalene-2-diazonium-betaine