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In the title compound, C 13H 12O, the cyclo-pentene ring fused with the naphthalene group adopts an envelope conformation. The cyclo-pentene torsion angle, with the fusion bond at the centre, has a magnitude of 1.16 (16)°. In the crystal, neigh-bouring molecules are connected through O - H?O hydrogen bonds into an R 4 4(8) ring motif. The crystal packing also features weak ?-? stacking interactions [centroid-centroid distance = 3.8981 (8) Å] and C - H?? interactions.