Benzenesulfonicacid, 4-[4-[(3-chloro-2-hydroxy-5-nitrophenyl)azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-(9CI); Benzenesulfonic acid,p-[4-(3-chloro-2-hydroxy-5-nitrophenylazo)-3-methyl-5-oxo-2-pyrazolin-1-yl]-(5CI)
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