201283-56-9
(2S,3S,3''S)-N-[3-(3-acetoxy-3-methoxycarbonylpropanamido)-3-t-butoxycarbonylpropanoyl]azetidine-2-carboxylic acid t-butyl ester
→
~95%
201283-57-0
(2S,3S,3''S)-N-[3-(3-acetoxy-3-methoxycarbonylpropanethioamido)-3-t-butoxycarbonylpropanethioyl]azetidine-2-carboxylic acid t-butyl ester