2-Pyrazolin-5-one,4-[(2-chloro-4-nitrophenyl)azo]-3-methyl-1-phenyl- (7CI,8CI); 3H-Pyrazol-3-one,4-[(2-chloro-4-nitrophenyl)azo]-2,4-dihydro-5-methyl-2-phenyl- (9CI)
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