BETA-OXO-1-BOC-3-AZETIDINEPROPANOIC ACID ETHYL ESTER; tert-butyl 3-(3-ethoxy-3-oxopropanoyl)azetidine-1-carboxylate; Ethyl b-oxo-1-Boc-3-azetidinepropanoate; 1-Boc-3-(3-ethoxy-3-oxopropanoyl)azetidine; 3-Azetidinepropanoic acid, 1-[(1,1-dimethylethoxy)carbonyl]-β-oxo-, ethyl ester;