tert-butyl N-(3-methyl-2-oxooxetan-3-yl)carbamate

N-(tert-butoxycarbonyl)-D-serine hydroxamic acid

N-tert-butoxycarbonyl-β-iodo-(S)-alanine allyl ester

methyl (1R,4R,8R)-8-((tert-butoxycarbonyl)-D-seryl)-3-oxo-2-oxabicyclo[2.2.2]oct-5-ene-6-carboxylate

methyl (1R,4R,8R)-8-((S)-3-bromo-2-((tert-butoxycarbonyl)amino)propanoyl)-3-oxo-2-oxabicyclo[2.2.2]oct-5-ene-6-carboxylate