1-(2,5-Dichloro-4-sulfophenyl)-3-methyl-5-pyrazolone 2,5-Dichloro-4-(3-methyl-5-oxo-2-pyrazolin-1-yl)benzenesulfonic acid 2,5-Dichloro-4-(3-methyl-5-oxo-2-pyrazolin-1-yl)benzenesulphonic acid 3-Methyl-1,2,5-dichloro-4-sulfophenylpyrazole-5-one 3-Methyl-1-2,5-dichloro-4-sulphophenylpyrazole-5-one 84-57-1 Benzenesulfonic acid, 2,5-dichloro-4-(3-methyl-5-oxo-2-pyrazolin-1-yl)- Benzenesulfonic acid, 2,5-dichloro-4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)- Dichlorsulfofenyl-methylpyrazolon [Czech] EINECS 201-541-7 Kyselina 2,5-dichlor-4-(3'-methyl-5'-pyrazolon-1'-yl)benzensulfonova [Czech] NSC 50666