Crystal structure of N′-hy­droxy­pyrimidine-2-carboximidamide

The title compound, C(5)H(6)N(4)O, is approximately planar, with an angle of 11.04 (15)° between the planes of the pyrimidine ring and the non-H atoms of the carboximidamide unit. The mol­ecule adopts an E configuration about the C=N double bond. In the crystal, adjacent mol­ecules are linked by pairs of N—H⋯O hydrogen bonds, forming inversion dimers with an R (2) (2)(10) ring motif. The dimers are further linked via N—H⋯N and O—H⋯N hydrogen bonds into a sheet structure parallel to the ac plane. The crystal structure also features N—H⋯O and weak C—H⋯O hydrogen bonds and offset π–π stacking inter­actions between adjacent pyrimidine rings [centroid–centroid distance = 3.622 (1) Å].