| Summary: | The title hydrated quinoline derivative, C11H9NO3·2H2O, crystallizes as a zwitterion in which the quinoline N atom is protonated. The quinoline ring is essentially planar, with a maximum deviation of 0.017 (2) Å. An intramolecular N—H...O hydrogen bond between the protonated N atom and the O atom of the carboxylate group in the zwitterion forms an S(5) ring motif. In the crystal, the zwitterions are connected into inversion dimers via pairs of N—H...O and C—H...O hydrogen bonds with R22(4) and R12(6) motifs. The water molecules are connected via O—H...O hydrogen bonds, forming supramolecular chains along the c axis. Furthermore, the chains and the dimers are connected via O—H...O hydrogen bonds, forming ladder-like supramolecular ribbons along the c axis.
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