Synonyms:
2,5-dichloro-4-[4-[(2-chlorophenyl)azo]-4,5-dihydro-3-methyl-5-oxo-1h-pyrazol-1-yl]benzenesulphonic acid ; 2,5-dichloro-4-[[4-[(2-chlorophenyl)azo]-4,5-dihydro-3-methyl-5-oxo-1h-pyrazol]-1-yl]benzenesulfonic acid ; benzenesulfonicacid, 2,5-dichloro-4-[4-[(2-chlorophenyl)azo]-4,5-dihydro-3-methyl-5-oxo-1h-pyrazol-1-yl]-(9ci) ; benzenesulfonic acid,2,5-dichloro-4-[4-[2-(2-chlorophenyl)diazenyl]-4,5-dihydro-3-methyl-5-oxo-1h-pyrazol-1-yl]-