methyl 6-[N-(benzyloxycarbonyl)-N-[(trimethylsilyl)methyl]amino]hex-2-enoate

benzyl (4-oxobutyl)((trimethylsilyl)methyl)carbamate

ethyl 3-hydroxy-3,6-dihydro-2H-pyridine-1-carboxylate

ethyl 3-(2-oxoethyl)-3,6-dihydro-2H-pyridine-1-carboxylate

2-(1-ethoxycarbonyl-3,6-dihydro-2H-pyridin-3-yl)acetic acid