2-Diazo-5-sulfonaphthalene-1(2H)-one

5,6-Dihydro-5-oxo-6-diazonaphthalene-1-sulfonic acid

2-Diazo-1-oxo-1,2-dihydronaphthalene-5-sulfonic acid

1-Oxo-2-diazo-1,2-dihydronaphthalene-5-sulfonic acid

6-Diazo-5,6-dihydro-5-oxo-1-naphthalenesulfonic acid

6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulphonic acid