KC3H4O5CH crystallizes in the monoclinic P2_1/c space group. The structure consists of four 02329_fluka molecules inside a KC3H4O5 framework. In the KC3H4O5 framework, K(1) is bonded in a 8-coordinate geometry to one H(5), one O(1), one O(2), one O(4), two equivalent O(3), and two equivalent O(5) atoms. The K(1)-H(5) bond length is 2.98 Å. The K(1)-O(1) bond length is 2.85 Å. The K(1)-O(2) bond length is 2.83 Å. The K(1)-O(4) bond length is 3.05 Å. There is one shorter (2.59 Å) and one longer (2.85 Å) K(1)-O(3) bond length. There is one shorter (2.73 Å) and one longer (2.82 Å) K(1)-O(5) bond length. There are three inequivalent C sites. In the first C site, C(3) is bonded in a distorted single-bond geometry to one H(5) atom. The C(3)-H(5) bond length is 1.09 Å. In the second C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(4)-O(3) bond length is 1.25 Å. The C(4)-O(4) bond length is 1.30 Å. In the third C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.32 Å. The C(1)-O(2) bond length is 1.24 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(1) and one O(4) atom. The H(1)-O(1) bond length is 1.09 Å. The H(1)-O(4) bond length is 1.37 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) atom. The H(2)-O(5) bond length is 0.99 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(5) atom. The H(3)-O(5) bond length is 0.98 Å. In the fourth H site, H(5) is bonded in a single-bond geometry to one K(1) and one C(3) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1), one C(1), and one H(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one K(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(4) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one K(1), one C(4), and one H(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to two equivalent K(1), one H(2), and one H(3) atom. Linkers: 2 [O]C(=O)[C@H]1[C@H](C(=O)O)[C@H](C([O])=O)[C@H]1C(=O)O ,1 [O]C(=O)[C@H]1[C@H](C(=O)O)[C@H]([C]=O)[C@H]1C(=O)O ,1 [O]C(=O)[C@H]1[C@@H](C(=O)O)[C@H]([C]=O)[C@@H]1C(=O)O. Metal clusters: 4 [K]. The MOF has largest included sphere 1.12 A, density 1.88 g/cm3, surface area 1714.13 m2/g, accessible volume 0.02 cm3/g