Crystal structure of 3-(4-chloro-phen-oxy)-4-(2-nitro-phen-yl)azetidin-2-one with an unknown solvate.

In the title compound, C15H11ClN2O4, the central β-lactam ring is approximately planar [maximum deviation = 0.044†(2)†à for the N atom from the mean plane] and subtends dihedral angles of 61.17†(11) and 40.21†(12) °, respectively, with the nitro and chloro-benzene rings. Both substituents lie to the same side of the β-lactam core. In the crystal, N-H⋯O hydrogen bonds link the mol-ecules into C(4) chains propagating in [010]. The chains are cross-linked by C-H⋯O and weak C-H⋯π inter-actions, generating a three-dimensional network. The solvent mol-ecules were found to be highly disordered and their contribution to the scattering was removed with the SQUEEZE procedure in PLATON [Spek (2009 ▶). Acta Cryst. D65, 148-155], which indicated a solvent cavity of volume 318†à (3) containing approximately 114 electrons. These solvent mol-ecules are not considered in the given chemical formula and other crystal data.