6-Oxo-1,6-dihydro-pyridazine-3-carbaldehyde monohydrate.
In the title hydrate, C(5)H(4)N(2)O(2)·H(2)O, the pyridazine ring is essentially planar, with an r.m.s. deviation of 0.0025 Å. In the crystal, O-H⋯O and N-H⋯O hydrogen bonds link the mol-ecules into a one-dimensional chain.
School of Chemistry and Chemical Engineering, Linyi University, Linyi 276005,  People's Republic of China.
Lei
L
Wang