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