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The title compound, C 18 H 16 ClNO 2 , is the main product of a photoreaction. The two benzene rings make a dihedral angle of 86.40 (2)° with each other. The 1,3-oxazepine C atom to which the 4-chloro­phenyl group is attached and the C atom of the 4-chloro­phenyl group attached to the 1,3-oxazepine ring are chiral C atoms, but the crystal is a racemate in which the enanti­omers are linked by a pair of weak inter­molecular C—H⋯O hydrogen bond, forming an inversion dimer.

(3aR*,5R*)-5-(4-Chlorophenyl)-1,2,3,3a-tetrahydrobenzo[e]pyrrolo[2,1-b][1,3]oxazepin-10(5H)-one

(3aR,5R)-5-(4-Chlorophenyl)-1,2,3,3a-tetrahydrobenzo[e]pyrrolo[2,1-b][1,3]oxazepin-10(5H)-one