3-{5-[4-Ethyl-3-methyl-5-oxo-1,5-dihydro-pyrrol-(2Z)-ylidenemethyl]-4-methyl-1H-pyrrol-3-yl}-propionic acid allyl ester

3-{5-[allyloxycarbonyl-(4-methyl-5-oxo-3-propylidene-pyrrolidin-2-ylidene)-methyl]-2-formyl-4-methyl-1H-pyrrol-3-yl}-propionic acid allyl ester

1-(4-methoxy-benzyl)-3-methyl-4-propylidene-pyrrolidine-2,5-dione

1-(4-Methoxy-benzyl)-3-methyl-pyrrole-2,5-dione

3-methyl-4-propylidene-pyrrolidine-2,5-dione