Synonyms: AC1L41M4;148240-74-8;691410-39-6;94612-72-3;Benzenesulfonic acid, 4-chloro-2-((1-(2,5-dichloro-4-sulfophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)-5-methyl-, calcium salt (1:1);Benzenesulfonic acid, 4-chloro-2-(2-(1-(2,5-dichloro-4-sulfophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)diazenyl)-5-methyl-, calcium salt (1:1);calcium 4-chloro-2-[[1-(2,5-dichloro-4-sulfonatophenyl)-3-methyl-5-oxo-4H-pyrazol-4-yl]diazenyl]-5-methylbenzenesulfonate