7-Amino-1,8-naphthyridin-2(1H)-one monohydrate

In the crystal structure of the title compound, C(8)H(7)N(3)O·H(2)O, adjacent organic mol­ecules are linked together into a tape along the a axis through N—H⋯N and N—H⋯O hydrogen bonds. On the other hand, water mol­ecules are linked together to form a chain along the b axis through O—H⋯O hydrogen bonds. The water chains and the organic mol­ecular tapes are further connected by inter­molecular O—H⋯O hydrogen bonds, forming a three-dimensional network. In addition, a π–π stacking inter­action between the 1,8-naphthyridine ring systems with an inter­planar separation of 3.246 (1) Å and a centroid–centroid distance of 3.825 (2) Å is observed.