K3C6N3H4O11 crystallizes in the trigonal P3_121 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. Both K(1)-O(2) bond lengths are 2.93 Å. Both K(1)-O(3) bond lengths are 2.87 Å. Both K(1)-O(4) bond lengths are 2.75 Å. Both K(1)-O(6) bond lengths are 2.80 Å. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and three equivalent O(5) atoms. The K(2)-O(1) bond length is 2.78 Å. The K(2)-O(2) bond length is 2.80 Å. The K(2)-O(3) bond length is 2.72 Å. The K(2)-O(4) bond length is 2.78 Å. The K(2)-O(6) bond length is 2.87 Å. There are a spread of K(2)-O(5) bond distances ranging from 2.72-3.18 Å. There are four inequivalent C sites. In the first C site, C(4) is bonded in a distorted single-bond geometry to one N(2) atom. The C(4)-N(2) bond length is 1.40 Å. In the second C site, C(1) is bonded in a single-bond geometry to one O(1) atom. The C(1)-O(1) bond length is 1.26 Å. In the third C site, C(2) is bonded in a distorted single-bond geometry to one N(1) atom. The C(2)-N(1) bond length is 1.40 Å. In the fourth C site, C(3) is bonded in a distorted single-bond geometry to one O(4) atom. The C(3)-O(4) bond length is 1.27 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(2), one O(2), and one O(3) atom. The N(1)-O(2) bond length is 1.27 Å. The N(1)-O(3) bond length is 1.27 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(4) and two equivalent O(5) atoms. Both N(2)-O(5) bond lengths are 1.27 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(6) atom. The H(1)-O(6) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. The H(2)-O(6) bond length is 0.98 Å. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to three equivalent K(2) and one N(2) atom. In the second O site, O(6) is bonded in a water-like geometry to one K(1), one K(2), one H(1), and one H(2) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(2) and one C(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one N(1) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one N(1) atom. In the sixth O site, O(4) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one C(3) atom. Linkers: 3 O=C1[C]([N+](=O)[O-])C(=O)[C]([N+](=O)[O-])C(=O)[C]1[N+](=O)[O-]. Metal clusters: 9 [K]. The MOF has largest included sphere 1.36 A, density 2.07 g/cm3, surface area 0.00 m2/g, accessible volume 0.00 cm3/g