乙醇

2-diazonio-1-ethoxy-3-hydroxy-5-methylhex-1-en-1-olate

ethyl 2,3-dimethyl-5-oxo-1,2-oxazole-4-carboxylate

乙酰基丙二酸二乙酯

ethyl 3-methyl-5-oxo-2,5-dihydroisoxazole-4-carboxylate sodium salt