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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—H...O, O—H...O and O—H...N hydrogen bonds.
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