1-Naphthalenesulfonic acid, 4-diazo-3,4-dihydro-7-nitro-3-oxo- 101667-26-9 117255-15-9 123216-22-8 155668-12-5 172683-35-1 4-Diazo-3,4-dihydro-7-nitro-3-oxonaphthalene-1-sulphonic acid 5366-84-7 63589-25-3 65180-76-9 92815-48-0 EINECS 264-347-1