Synonyms: 1-Naphthalenesulfonicacid, 6-diazo-5,6-dihydro-5-oxo-, 1-[(2-hydroxy-1-naphthyl)methyl]-2-naphthylester (7CI,8CI); 2-Naphthol, 1,1'-methylenedi-,mono(6-diazo-5,6-dihydro-5-oxo-1-naphthalenesulfonate) (8CI);2-[1,2-Naphthoquinone 2-diazide-5-sulfonyloxy]-2'-hydroxydinaphthylmethane