K2BeC4H2O9(CH)4 crystallizes in the orthorhombic Pnna space group. The structure consists of sixteen 02329_fluka molecules inside a K2BeC4H2O9 framework. In the K2BeC4H2O9 framework, K(1) is bonded in a 6-coordinate geometry to one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms. The K(1)-O(2) bond length is 2.86 Å. The K(1)-O(5) bond length is 2.83 Å. There is one shorter (2.78 Å) and one longer (2.93 Å) K(1)-O(3) bond length. There is one shorter (2.65 Å) and one longer (2.79 Å) K(1)-O(4) bond length. Be(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Be(1)-O(1) bond lengths are 1.63 Å. Both Be(1)-O(2) bond lengths are 1.61 Å. 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(3) atom. The C(1)-O(1) bond length is 1.30 Å. The C(1)-O(3) 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(2) and one O(4) atom. The C(4)-O(2) bond length is 1.30 Å. The C(4)-O(4) bond length is 1.25 Å. H(3) is bonded in a single-bond geometry to one O(5) atom. The H(3)-O(5) bond length is 0.99 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Be(1) and one C(1) atom. In the second O site, O(5) is bonded in a water-like geometry to two equivalent K(1) and two equivalent H(3) atoms. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(1), one Be(1), and one C(4) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(4) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(1) atom. Linkers: 8 [O]C(=O)/C=C\C([O])=O. Metal clusters: 8 [K] ,4 [Be]. The MOF has largest included sphere 2.37 A, density 1.69 g/cm3, surface area 2255.18 m2/g, accessible volume 0.04 cm3/g