4-benzyloxycarbonyl azetidin-2-one;BENZYL4-OXO-2-AZETIDINECARBOXYLATE;azetidinone-4-carboxylic acid benzyl ester;benzyl (R)-azetidin-2-one-4-carboxylate;2-azetidinecarboxylic acid,4-oxo-,phenylmethyl ester;
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