Ethyl 3-methyl-2-oxo-6-vinyl-3,4,5,6-tetrahydro-2H-1,3-oxazine-5-carboxylate

ethyl 1-methyl-3-(phenylsulfinyl)piperidine-3-carboxylate

3-哌啶甲酸乙酯（盐酸盐）

ethyl 1-methylpyridin-1-ium-3-carboxylate,iodide

1-甲基-3-哌啶甲酸乙酯