1,4-dihydro-3,5-dimethoxycarbonyl-1-methylpyridine

2.4(1H.3H)-嘧啶二酮

6-methoxy-1,3-dimethyl-1,3-diazinane-2,4-dione

methyl 3-methylamino-2-(N-methylcarbamoyl)propenoate

6-(hydroxymethyl)-1,3-dimethyl-1,3-diazinane-2,4-dione