Methacrylic acid 2-(2,5-dioxo-3,4-dimethyl-1-pyrrolyl)ethyl ester

2-(2,5-dihydro-3,4-dimethyl-2,5-dioxo-1H-pyrrol-1-yl)ethyl methacrylate

2-Methylpropenoic acid 2-[(2,5-dihydro-3,4-dimethyl-2,5-dioxo-1H-pyrrol)-1-yl]ethyl ester