title: Methyl 1-ethyl-7-methyl-4-oxo-1,4-di-hydro-1,8-naphthyridine-3-carboxyl-ate monohydrate.
abstract: In the structure of the title compound, C(13)H(14)N(2)O(3)·H(2)O, 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-H⋯O contacts link pairs of naphthyridine mol-ecules into head-to-tail dimers. These are joined by strong O-H⋯O hydrogen bonds from the water molecules into infinite chains along the a axis.
authors.forename: Rehana
authors.initials: R
authors.lastname: Yasmeen
authors.forename: Muhammad
authors.initials: M
authors.lastname: Zia-Ur-Rehman
authors.forename: Muhammad Azim
authors.initials: MA
authors.lastname: Khattak
authors.forename: Muhammad Nadeem
authors.initials: MN
authors.lastname: Arshad
authors.forename: Islam Ullah
authors.initials: IU
authors.lastname: Khan