Benzenesulfonicacid, 2-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]- (9CI);Benzenesulfonic acid, o-(3-methyl-5-oxo-1-phenyl-2-pyrazolin-4-ylazo)- (6CI);NSC 114441
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