ethyl 4-((E)-2-(dimethylamino)vinyl)-2,5-dihydro-5,5-dimethyl-2-oxofuran-3-carboxylate

甲胺

1,1-二甲基呋喃并[3,4-c]吡啶-3,4(1H,5H)-二酮

4-methoxy-1,1-dimethylfuro[3,4-c]pyridin-3-one

4-Cyanomethyl-5,5-dimethyl-2-oxo-2,5-dihydro-furan-3-carboxylic acid methyl ester