organic compounds
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In the structure of the title compound, C13H14N2O3·H2O, all atoms of the organic molecule except the terminal methyl group of the ethyl group attached to the N atom of the pyridinone ring are roughly coplanar, with an r.m.s. deviation of 0.0897 Å. In the crystal, C—HO contacts link pairs of naphthyridine molecules into head-to-tail dimers. These are joined by strong O—HO hydrogen bonds from the water molecules into infinite chains along the a axis.