KC6NH5O3 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 7-coordinate geometry to two equivalent O(1), two equivalent O(3), and three equivalent O(2) atoms. There is one shorter (2.78 Å) and one longer (2.81 Å) K(1)-O(1) bond length. There is one shorter (2.80 Å) and one longer (2.88 Å) K(1)-O(3) bond length. There are a spread of K(1)-O(2) bond distances ranging from 2.72-3.02 Å. There are six inequivalent C sites. In the first C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(6) atom. The C(3)-C(2) bond length is 1.40 Å. The C(3)-C(4) bond length is 1.40 Å. The C(3)-C(6) bond length is 1.50 Å. In the second C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(4) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(4) bond length is 1.09 Å. In the third C site, C(5) is bonded in a distorted trigonal planar geometry to one C(1), one C(4), and one H(5) atom. The C(5)-C(1) bond length is 1.40 Å. The C(5)-H(5) bond length is 1.09 Å. In the fourth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(6)-O(1) bond length is 1.28 Å. The C(6)-O(2) bond length is 1.27 Å. In the fifth C site, C(1) is bonded in a distorted trigonal planar geometry to one C(1), one C(5), and one N(1) atom. The C(1)-C(1) bond length is 1.48 Å. The C(1)-N(1) bond length is 1.35 Å. In the sixth C site, C(2) is bonded in a distorted trigonal planar geometry to one C(3), one N(1), and one H(3) atom. The C(2)-N(1) bond length is 1.33 Å. The C(2)-H(3) bond length is 1.09 Å. N(1) is bonded in a bent 120 degrees geometry to one C(1) and one C(2) atom. There are five inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(1) and one O(3) atom. The H(1)-O(1) bond length is 1.62 Å. The H(1)-O(3) bond length is 1.01 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(3) atom. The H(2)-O(3) bond length is 0.97 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(4) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(5) atom. There are three inequivalent O sites. In the first O site, O(3) is bonded in a water-like geometry to two equivalent K(1), one H(1), and one H(2) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(1), one C(6), and one H(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to three equivalent K(1) and one C(6) atom. Linkers: 2 [O]C(=O)c1ccc(-c2ccc(C([O])=O)cn2)nc1. Metal clusters: 4 [K]. The MOF has largest included sphere 2.97 A, density 1.51 g/cm3, surface area 2683.11 m2/g, accessible volume 0.11 cm3/g