KH2(CO)4(CH)3 crystallizes in the monoclinic P2_1/c space group. The structure consists of twelve 02329_fluka molecules inside a KH2(CO)4 framework. In the KH2(CO)4 framework, K(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The K(1)-O(1) bond length is 3.00 Å. There is one shorter (2.75 Å) and one longer (2.79 Å) K(1)-O(2) bond length. There is one shorter (2.81 Å) and one longer (2.91 Å) K(1)-O(3) bond length. There is one shorter (2.76 Å) and one longer (2.91 Å) K(1)-O(4) bond length. There are four inequivalent C sites. In the first C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one O(3) atom. The C(3)-C(2) bond length is 1.42 Å. The C(3)-O(3) bond length is 1.36 Å. In the second C site, C(7) is bonded in a distorted single-bond geometry to one C(2) and one O(4) atom. The C(7)-C(2) bond length is 1.42 Å. The C(7)-O(4) bond length is 1.36 Å. In the third C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.47 Å. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.29 Å. In the fourth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(7) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a bent 150 degrees geometry to one O(2) and one O(3) atom. The H(1)-O(2) bond length is 1.52 Å. The H(1)-O(3) bond length is 1.04 Å. In the second H site, H(5) is bonded in a bent 150 degrees geometry to one O(1) and one O(4) atom. The H(5)-O(1) bond length is 1.48 Å. The H(5)-O(4) bond length is 1.05 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted water-like geometry to two equivalent K(1), one C(7), and one H(5) atom. In the second O site, O(3) is bonded in a distorted water-like geometry to two equivalent K(1), one C(3), and one H(1) atom. In the third O site, O(1) is bonded in a water-like geometry to one K(1), one C(1), and one H(5) atom. In the fourth O site, O(2) is bonded in a distorted water-like geometry to two equivalent K(1), one C(1), and one H(1) atom. Linkers: 4 [O]C(=O)c1c(O)cccc1O. Metal clusters: 4 [K]. RCSR code: hcb. The MOF has largest included sphere 2.17 A, density 1.69 g/cm3, surface area 2600.35 m2/g, accessible volume 0.11 cm3/g