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The mol­ecule of the title compound, C13H9NO2, is slightly twisted with a dihedral angle of 4.85 (9)° between the nine-membered ring system and the phenyl ring. The nine non-H atoms of the 1H-pyrrolo[2,1-c][1,4]oxazin-1-one system are coplanar [r.m.s. deviation = 0.0122 (2) Å]. In the crystal, weak inter­molecular C—H...O inter­actions link mol­ecules into chains along [1\overline{1}0]. The crystal studied was an inversion twin with a 0.48624 (9):0.51376 (9) domain ratio.
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