(2S,3S,3''S)-N-[3-(3-acetoxy-3-methoxycarbonylpropanamido)-3-tert-butoxycarbonylpropanoyl]azetidine-2-carboxylic Acid tert-butyl Ester
(2S,3S,3''S)-N-[3-(3-acetoxy-3-methoxycarbonylpropanamido)-3-tert-butoxycarbonylpropanoyl]azetidine-2-carboxylic Acid tert-butyl Ester;(αS,2S)-α-[[(3S)-3-(Acetyloxy)-4-Methoxy-1,4-dioxobutyl]aMino]-2-[(1,1-diMethylethoxy)carbonyl]-γ-oxo-1-azetidinebutan