KC3NHO2 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 8-coordinate geometry to two equivalent N(1), two equivalent O(2), and four equivalent O(1) atoms. There is one shorter (2.90 Å) and one longer (3.15 Å) K(1)-N(1) bond length. There is one shorter (2.79 Å) and one longer (2.85 Å) K(1)-O(2) bond length. There are a spread of K(1)-O(1) bond distances ranging from 2.81-2.97 Å. There are four inequivalent C sites. In the first C site, C(4) is bonded in a trigonal planar geometry to two equivalent N(1) and one H(2) atom. Both C(4)-N(1) bond lengths are 1.34 Å. The C(4)-H(2) bond length is 1.09 Å. In the second C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one C(3), and one N(1) atom. The C(1)-C(2) bond length is 1.39 Å. The C(1)-C(3) bond length is 1.53 Å. The C(1)-N(1) bond length is 1.35 Å. In the third C site, C(2) is bonded in a distorted single-bond geometry to two equivalent C(1) and one H(1) atom. The C(2)-H(1) bond length is 1.08 Å. In the fourth C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(3)-O(1) bond length is 1.27 Å. The C(3)-O(2) bond length is 1.26 Å. N(1) is bonded in a distorted bent 120 degrees geometry to two equivalent K(1), one C(1), and one C(4) atom. There are two 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(4) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to four equivalent K(1) and one C(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(3) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)ncn1. Metal clusters: 8 [K]. The MOF has largest included sphere 1.11 A, density 2.05 g/cm3, surface area 1281.75 m2/g, accessible volume 0.02 cm3/g