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In the title hydrated mol­ecular salt, C 4 H 12 N + ·C 2 HO 4   − ·0.5H 2 O, the O atom of the water mol­ecule lies on a crystallographic twofold axis. The dihedral angle between the CO 2  and CO 2 H planes of the anion is 18.47 (8)°. In the crystal, the anions are connected to each other by strong near-linear O—H⋯O hydrogen bonds. The water mol­ecules are located between the chains of anions and iso­butyl­amine cations; their O atoms participate as donors and acceptors, respectively, in O—H⋯O and N—H⋯O hydrogen bonds, which form channels (dimensions = 4.615 and 3.387 Å) arranged parallel to [010].

Crystal structure of isobutylammonium hydrogen oxalate hemihydrate