乙氧基甲叉丙二酸二乙酯

ethyl 5-ethoxyisoxazole-4-carboxylate

乙基5-氧代-2,5-二氢-1,2-恶唑-4-羧酸酯

(ethylsulfanyl-methylene)-malonic acid diethyl ester

4-bromo-3-phenyl-4H-isoxazol-5-one