6-Amino-5-hydroxyiminomethyl-1-methyluracil Hydrate

In the title compound, 6-amino-5-hydroxyimino­methyl-1-methyl-2,4(1H,3H)-pyrimidinedione hydrate, C₆H₈N₄O₃.H₂O, the uracil moieties are linked by N—H...O hydrogen bonds [N...O 2.814 (3)Å] resulting in centrosymmetric base-paired dimers which are then linked in a three-dimensional network through hydrogen bonding, with a water molecule of crystallization [N...O 3.105 (3), O...O 2.748 (3) and 2.817 (3), and 2.873 (3)Å]. There is also an intramolecular N—H...N hydrogen bond [N...N 2.680 (3)Å] between adjacent amino and hydroxyimino groups. All available hydrogen-bond donors are utilized.

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