Synonyms: 1-Naphthalenesulfonic acid, 2-((1-(2,5-dichloro-4-sulfophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)-, sodium salt, compd. with 2,2',2''-nitrilotris(ethanol);1-Naphthalenesulfonic acid, 2-(2-(1-(2,5-dichloro-4-sulfophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)diazenyl)-, sodium salt, compd. with 2,2',2''-nitrilotris(ethanol) (1:?:?);68966-47-2