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Tert-Butyl 3-(4-Chlorophenyl)-5-Oxo-2h-Pyrrole-1-Carboxylate Tert-Butyl 4-(4-Chlorophenyl)-2-Oxo-2,5-Dihydro-1H-Pyrrole-1-Carboxylate 4-(4-chlorophenyl)-2-oxo-2,5-dihydropyrrole-1-carboxylic acid tert-butyl ester Tert-Butyl 4-(4-Chlorophenyl)-2-Oxo-2,5-Dihydro-1H-Pyrrole-1-Carboxylate(WXC04411) 1H-Pyrrole-1-carboxylic acid, 4-(4-chlorophenyl)-2,5-dihydro-2-oxo-, 1,1-dimethylethyl ester