cis‐6‐Phenyl‐4bH,6H,11H,13H‐isoindolo[1,2‐c]benz[2,4]oxazepin‐13‐one

The title compound, C₂₂H₁₇NO₂, contains an isoindolinone moiety joined to a phenyl‐substituted benzoxazepine ring. The isoindolinone moiety is essentially planar and the oxazepine ring adopts a distorted chair conformation, with the phenyl substituent equatorial. Owing to the severe puckering of the central oxazepine ring, the mol­ecule as a whole is non‐planar; the benzene ring of the benzoxazepine fragment makes an angle of 67.7 (1)° with respect to the isoindoline ring.