R-(-)-3-ethoxycarbonyl-3-(pyrrol-1-yl)pyrrolidin-2,5-dione
(R)-2',5'-Dioxo-1',2',4',5'-tetrahydro-[1,3']bipyrrolyl-3'-carboxylic acid ethyl ester
ethyl (R)-2,5-dioxo-3-(pyrrol-1-yl)pyrrolidine-3-carboxylate
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