In C12H18N2O2.H2O, the oximic OH group is anti (trans) to the quinoid
carbonyl group, thus there are no intramolecular hydrogen bonds in the
molecule. Extensive intermolecular interactions between neighbouring
quinone oxime molecules and associated water molecules are observed. B
ond distances are intermediate between those predicted for the 1,2-qui
none oxime and 2,5-oxime imino forms.