1-Azetidinecarboxylicacid, 2-oxo-4-phenyl-3-[(triethylsilyl)oxy]-, 1,1-dimethylethyl ester,(3R-cis)-;(3R,4S)-2-Oxo-4-phenyl-3-[(triethylsilyl)oxy]-1-azetidinecarboxylicacid 1,1-dimethylethyl ester;
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