Synonyms: 1-Naphthalenesulfonicacid, 6-diazo-5,6-dihydro-5-oxo-, sodium salt (7CI,8CI,9CI);1,2-Naphthoquinone-2-diazido-5-sulfonic acid sodium salt;NA 125;Sodium1,2-naphthoquinone diazide 5-sulfonate;Sodium1,2-naphthoquinone-2-diazide-5-sulfonate;Sodium 2,1-diazonaphthol-5-sulfonate;Sodium 2-diazo-1-hydroxynaphthalene-5-sulfonate;Sodium2-diazo-1-oxo-1,2-dihydronaphthalene-5-sulfonate;