Benzenesulfonicacid, 4-[4-[(2-chlorophenyl)azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-(9CI); Benzenesulfonic acid,p-[4-[(o-chlorophenyl)azo]-3-methyl-5-oxo-2-pyrazolin-1-yl]- (8CI)
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