In the title hydrate, C12H13NO4·H2O, the piperidine ring that is fused to the benzene ring is in a sofa conformation with the chiral C atom lying 0.4084 (18) Å out of the plane of the nine fused-ring atoms. In the crystal, O—H⋯O and N—H⋯O hydrogen bonds link the organic molecules and water molecules into chains running along the b-axis direction. The chains are further connected into layers parallel to the bc plane by π–π interactions between inversion-related benzene rings [centroid–centroid distance = 3.8846 (9) Å].
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.003 Å; R factor = 0.039; wR factor = 0.102; data-to-parameter ratio = 8.5.In the title compound, C 16 H 13 NO 2 , the quinoline system is approximately planar with a maximum deviation from the least-squares plane of 0.059 (1) Å for the N atom. The phenyl ring is rotated by 62.16 (4) with respect to the plane of the quinoline system. In the crystal, O-HÁ Á ÁO hydrogen bonds link molecules into infinite chains running along the b-axis direction.
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