1-Naphthalenesulfonic acid, 2-((1-(2-chlorophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)-, potassium salt 2-Pyrazolin-5-one, 1-(2-chlorophenyl)-3-methyl-4-((1-sulfo-2-naphthalenyl)azo)-, potassium salt 67875-12-1 EINECS 267-526-2 Potassium 2-((1-(2-chlorophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)naphthalene-1-sulphonate