Mn5H2(C4O9)2(CH3)8 crystallizes in the tetragonal I4_1/a space group. The structure consists of sixty-four 02329_fluka molecules inside a Mn5H2(C4O9)2 framework. In the Mn5H2(C4O9)2 framework, there are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form edge-sharing MnO6 octahedra. The Mn(1)-O(1) bond length is 2.25 Å. The Mn(1)-O(2) bond length is 2.11 Å. The Mn(1)-O(3) bond length is 2.20 Å. The Mn(1)-O(5) bond length is 2.22 Å. The Mn(1)-O(7) bond length is 2.10 Å. The Mn(1)-O(8) bond length is 2.27 Å. In the second Mn site, Mn(2) is bonded to one O(3), one O(4), one O(5), one O(6), and two equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 58°. The Mn(2)-O(3) bond length is 2.28 Å. The Mn(2)-O(4) bond length is 2.12 Å. The Mn(2)-O(5) bond length is 2.41 Å. The Mn(2)-O(6) bond length is 2.18 Å. There is one shorter (2.08 Å) and one longer (2.09 Å) Mn(2)-O(2) bond length. In the third Mn site, Mn(3) is bonded to two equivalent O(1), two equivalent O(8), and two equivalent O(9) atoms to form edge-sharing MnO6 octahedra. Both Mn(3)-O(1) bond lengths are 2.20 Å. Both Mn(3)-O(8) bond lengths are 2.22 Å. Both Mn(3)-O(9) bond lengths are 2.18 Å. There are four inequivalent C sites. In the first C site, C(8) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(6) atom. The C(8)-O(1) bond length is 1.29 Å. The C(8)-O(6) bond length is 1.23 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(2)-O(3) bond length is 1.27 Å. The C(2)-O(4) bond length is 1.24 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(9) atom. The C(3)-O(7) bond length is 1.25 Å. The C(3)-O(9) bond length is 1.26 Å. In the fourth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(8) atom. The C(5)-O(5) bond length is 1.26 Å. The C(5)-O(8) bond length is 1.28 Å. H(10) is bonded in a single-bond geometry to one O(2) atom. The H(10)-O(2) bond length is 0.85 Å. There are nine inequivalent O sites. In the first O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one C(3) atom. In the second O site, O(8) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(3), and one C(5) atom. In the third O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Mn(2) and one C(8) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one Mn(1), two equivalent Mn(2), and one H(10) atom. In the fifth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Mn(3) and one C(3) atom. In the sixth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Mn(2) and one C(2) atom. In the seventh O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(3), and one C(8) atom. In the eighth O site, O(3) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one C(2) atom. In the ninth O site, O(5) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one C(5) atom. Linkers: 32 CC([O])=O ,8 [OH]. Metal clusters: 20 [Mn]. The MOF has largest included sphere 4.80 A, density 1.41 g/cm3, surface area 3599.13 m2/g, accessible volume 0.37 cm3/g