organic compounds
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The asymmetric unit of the title co-crystal, C6H7N3O·0.5C4H6O4, comprises one N′-hydroxypyridine-2-carboximidamide molecule and half a succinic acid molecule (the whole molecule is generated by inversion symmetry). In the crystal, molecules are assembled into columns along [110], via strong N—HO, O—HO and O—HN hydrogen bonds.