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In the title compound, C 20 H 18 N 2 O 3 , the β-lactam ring is essentially planar, having a maximum deviation of 0.0291 (15) Å for the N atom, and perpendicular to the phenyl ring [dihedral angle = 85.55 (11)°]. The carbonitrile side chain is almost linear, the C—C—N angle being 176.8 (2)°. The crystal packing is stabilized by inter­molecular O—H⋯O and C—H⋯O inter­actions.

2-{Hydroxy[1-(4-methoxyphenyl)-4-oxo-3-phenylazetidin-2-yl]methyl}acrylonitrile