NSC 26425;NSC 4691;1-(2-Chloro-5-sulfophenyl)-3-methyl-5-pyrazolone;1-(6-Chloro-3-sulfophenyl)-3-methyl-5-pyrazolone;1-(2'-Chloro-5'-sulfophenyl)-3-methyl-5-pyrazolone;Benzenesulfonic acid,4-chloro-3-(3-methyl-5-oxo-2-pyrazolin-1-yl)- (6CI,7CI,8CI);2-Pyrazolin-5-one,1-(2-chloro-5-sulfophenyl)-3-methyl- (5CI);
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