KHC2O4CH2CH4O2 crystallizes in the monoclinic Cc space group. The structure consists of four 02329_fluka molecules and four water methanol molecules inside a KHC2O4 framework. In the KHC2O4 framework, K(1) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(2), and two equivalent O(4) atoms. The K(1)-O(5) bond length is 2.90 Å. There is one shorter (2.69 Å) and one longer (2.87 Å) K(1)-O(2) bond length. There is one shorter (2.66 Å) and one longer (2.76 Å) K(1)-O(4) bond length. There are two inequivalent C sites. In the first 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 1.30 Å. The C(1)-O(2) bond length is 1.25 Å. In the second C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(5) atom. The C(4)-O(4) bond length is 1.24 Å. The C(4)-O(5) bond length is 1.32 Å. H(2) is bonded in a linear geometry to one O(1) and one O(5) atom. The H(2)-O(1) bond length is 1.42 Å. The H(2)-O(5) bond length is 1.08 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one C(1) and one H(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(1) atom. In the third O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(4) atom. In the fourth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(1), one C(4), and one H(2) atom. Linkers: 1 [O]C(=O)C[C@H](O)C(=O)O. Metal clusters: 2 [K]. The MOF has largest included sphere 2.01 A, density 1.76 g/cm3, surface area 2164.48 m2/g, accessible volume 0.02 cm3/g