5-methyl-4-oxo-2-[(E)-3,3,3-trichloroprop-1-enyl]-1H-pyrimidine-6-carboxylic acid

ethyl 6-chloro-2,5-dimethyl-pyrimidine-4-carboxylate

5-溴-4-甲基-3-异噁唑甲醇

4-甲基-5-氧代-2H-恶唑-3-羧酸乙酯

4-ethoxy-3-methyl-4-oxobut-2-enoate