1H-pyrrole-3-carboxylic acid, 4,5-dihydro-2-methyl-1-(2-methylpropyl)-5-oxo-4-(2-thienylmethylene)-, methyl ester, (4Z)-;Methyl (4Z)-1-isobutyl-2-methyl-5-oxo-4-(2-thienylmethylene)-4,5-dihydro-1H-pyrrole-3-carboxylate
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