Benzenesulfonicacid, 4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-, sodium salt (9CI);Benzenesulfonic acid, p-(3-methyl-5-oxo-2-pyrazolin-1-yl)-, sodium salt (8CI);1-(4'-Sulfophenyl)-3-methyl-5-pyrazolone sodium salt
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