K2BC3H4O7CH crystallizes in the orthorhombic P2_12_12_1 space group. The structure consists of four 02329_fluka molecules inside a K2BC3H4O7 framework. In the K2BC3H4O7 framework, there are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The K(1)-O(1) bond length is 2.91 Å. The K(1)-O(2) bond length is 2.85 Å. The K(1)-O(3) bond length is 2.88 Å. The K(1)-O(4) bond length is 2.78 Å. The K(1)-O(5) bond length is 2.84 Å. The K(1)-O(6) bond length is 2.98 Å. The K(1)-O(7) bond length is 2.71 Å. In the second K site, K(2) is bonded in a 8-coordinate geometry to one H(3), one O(1), one O(2), one O(3), one O(4), one O(6), and two equivalent O(5) atoms. The K(2)-H(3) bond length is 2.96 Å. The K(2)-O(1) bond length is 2.87 Å. The K(2)-O(2) bond length is 3.14 Å. The K(2)-O(3) bond length is 2.74 Å. The K(2)-O(4) bond length is 3.32 Å. The K(2)-O(6) bond length is 2.92 Å. There is one shorter (2.78 Å) and one longer (2.88 Å) K(2)-O(5) bond length. B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The B(1)-O(1) bond length is 1.38 Å. The B(1)-O(2) bond length is 1.38 Å. The B(1)-O(3) bond length is 1.38 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(7) atom. The C(1)-O(4) bond length is 1.28 Å. The C(1)-O(7) bond length is 1.28 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one H(3) atom. The C(2)-H(3) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(3)-O(5) bond length is 1.27 Å. The C(3)-O(6) bond length is 1.28 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(1) and one O(4) atom. The H(1)-O(1) bond length is 1.02 Å. The H(1)-O(4) bond length is 1.63 Å. In the second H site, H(2) is bonded in a distorted linear geometry to one O(3) and one O(7) atom. The H(2)-O(3) bond length is 1.01 Å. The H(2)-O(7) bond length is 1.59 Å. In the third H site, H(3) is bonded in a single-bond geometry to one K(2) and one C(2) atom. In the fourth H site, H(5) is bonded in a linear geometry to one O(2) and one O(6) atom. The H(5)-O(2) bond length is 1.02 Å. The H(5)-O(6) bond length is 1.60 Å. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one C(3) atom. In the second O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(2), one C(3), and one H(5) atom. In the third O site, O(7) is bonded in a 3-coordinate geometry to one K(1), one C(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one K(2), one C(1), and one H(1) atom. In the fifth O site, O(1) is bonded in a distorted water-like geometry to one K(1), one K(2), one B(1), and one H(1) atom. In the sixth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(2), one B(1), and one H(5) atom. In the seventh O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(2), one B(1), and one H(2) atom. Linkers: 4 OB(O)O ,4 [O]C(=O)/C=C\C([O])=O. Metal clusters: 8 [K]. The MOF has largest included sphere 1.44 A, density 1.88 g/cm3, surface area 760.89 m2/g, accessible volume 0.02 cm3/g