2H-pyrrol-2-one, 4-acetyl-1,5-dihydro-3-hydroxy-5-(3-nitrophenyl)-1-[2-(1-piperazinyl)ethyl]-;Pyrrol-2(5H)-one, 4-acetyl-3-hydroxy-5-(3-nitrophenyl)-1-[2-(1-piperazinyl)ethyl]-
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