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In the title compound, C 11 H 11 NO 3 , a modified synthetic acetate derivative, the four memebered β-lactam ring is roughly planar, with a maximum deviation of 0.21 (3) Å, and makes a dihedral angle of 81.46 (14)° with the phenyl ring. In the crystal, a single N—H⋯O hydrogen bond links mol­ecules into a chain parallel to the  a  axis and thus stabilizes the structure. Although the absolute configuration could not be reliably determined, the compound corresponds to the diasteroisomer ( RS / SR )

(RS/SR)-2-Oxo-4-phenylazetidin-3-yl acetate