MnC7NH7O6 crystallizes in the monoclinic C2/c space group. Mn(1) is bonded in a distorted pentagonal bipyramidal geometry to one N(1), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. The Mn(1)-N(1) bond length is 2.29 Å. Both Mn(1)-O(1) bond lengths are 2.25 Å. Both Mn(1)-O(2) bond lengths are 2.55 Å. Both Mn(1)-O(3) bond lengths are 2.13 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one H(3) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-N(1) bond length is 1.34 Å. The C(1)-H(3) bond length is 1.09 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(4) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(4) bond length is 1.50 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(4) atom. The C(3)-H(4) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(4)-O(1) bond length is 1.28 Å. The C(4)-O(2) bond length is 1.27 Å. N(1) is bonded in a trigonal planar geometry to one Mn(1) and two equivalent C(1) atoms. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) and one O(3) atom. The H(1)-O(1) bond length is 1.71 Å. The H(1)-O(3) bond length is 1.00 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 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(1) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(3) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mn(1), one C(4), and one H(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Mn(1) and one C(4) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Mn(1), one H(1), and one H(2) atom. Linkers: 2 [O]C(=O)c1cncc(C([O])=O)c1. Metal clusters: 2 O.O.O=[C]O[Mn]O[C]=O. The MOF has largest included sphere 1.87 A, density 1.97 g/cm3, surface area 3158.37 m2/g, accessible volume 0.07 cm3/g