KC8H6O3 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 7-coordinate geometry to one O(3), three equivalent O(1), and three equivalent O(2) atoms. The K(1)-O(3) bond length is 2.92 Å. There are a spread of K(1)-O(1) bond distances ranging from 2.70-2.99 Å. There are a spread of K(1)-O(2) bond distances ranging from 2.69-2.81 Å. There are eight inequivalent C sites. In the first C site, C(2) is bonded in a distorted trigonal non-coplanar geometry to one H(1), one H(2), and one O(3) atom. The C(2)-H(1) bond length is 1.10 Å. The C(2)-H(2) bond length is 1.10 Å. The C(2)-O(3) bond length is 1.43 Å. In the second C site, C(3) is bonded in a distorted single-bond geometry to one C(4) and one O(3) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-O(3) bond length is 1.37 Å. In the third C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one H(3) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-H(3) bond length is 1.09 Å. In the fourth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one H(4) atom. The C(5)-C(6) bond length is 1.41 Å. The C(5)-H(4) bond length is 1.09 Å. In the fifth C site, C(6) is bonded in a trigonal planar geometry to one C(5), one C(6), and one C(7) atom. The C(6)-C(6) bond length is 1.48 Å. The C(6)-C(7) bond length is 1.41 Å. In the sixth C site, C(7) is bonded in a distorted trigonal planar geometry to one C(6), one C(8), and one H(5) atom. The C(7)-C(8) bond length is 1.39 Å. The C(7)-H(5) bond length is 1.09 Å. In the seventh C site, C(8) is bonded in a distorted single-bond geometry to one C(7) and one H(6) atom. The C(8)-H(6) bond length is 1.09 Å. In the eighth 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 1.27 Å. The C(1)-O(2) bond length is 1.27 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(7) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(8) atom. There are three inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to three equivalent K(1) and one C(1) atom. In the second O site, O(3) is bonded in a bent 120 degrees geometry to one K(1), one C(2), and one C(3) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to three equivalent K(1) and one C(1) atom. Linkers: 1 [O]C(=O)COc1ccc(-c2ccc(OCC([O])=O)cc2)cc1. Metal clusters: 4 [K]. The MOF has largest included sphere 1.30 A, density 1.69 g/cm3, surface area 2643.10 m2/g, accessible volume 0.06 cm3/g