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In the title compound, C19H25NO2, the dihedral angle between the benzene rings is 53.15 (8)°. One of the –OH groups forms an intra­molecular O—H...N link, generating an S(6) ring. The other –OH group forms an inter­molecular O—H...N hydrogen bond in the crystal, generating centrosymmetric R22(20) loops.

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The title compound, C17H21NO4, shows an intra­molecular hydrogen bond between a phenol OH group and the N atom. In the crystal, mol­ecules are connected by pairs of O—H...O hydrogen bonds into inversion dimers.

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The asymmetric unit of the title compound, 3C10H8N2·2C7H7NO2, consists of three mol­ecules of 4,4′-bipyridine (bpy) and two mol­ecules of 3-amino­benzoic acid (bza). Two mol­ecules of bza and two mol­ecules of bpy are connected via O—H...N, N—H...N and N—H...O hydrogen bonds, forming forming infinite double-stranded zigzag chains along the c axis. The third mol­ecule of bpy is linked to the chain by weak C—H...O inter­actions. Adjacent chains are linked via π–π inter­actions [centroid–centroid distances = 3.759 (3)–3.928 (3) Å] involving the pyridine rings of bpy mol­ecules, resulting in a sheet-like structure parallel to (100). These sheets are stacked via C—H...π inter­actions, resulting finally in the formation of a three-dimensional supra­molecular structure.
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