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The title compound, C23H18FNO4, crystallized as a racemate. It exhibits a cis conformation with respect to the F atom and the methine H atom. The piperidine ring has a screw-boat conformation. The methoxyphenyl ring and the phenyl ring are inclined to the mean plane of the isoquinoline ring system by 89.85 (4) and 46.62 (5)°, respectively, and by 78.15 (5)° to one another. In the crystal, molecules are linked by an O--H...O hydrogen bond forming chains propagating along the a-axis direction. The chains are linked by C--H...F hydrogen bonds, forming layers lying parallel to the ab plane. [ABSTRACT FROM AUTHOR]