MnH4(C2O)5(CH)2 crystallizes in the monoclinic P2_1/c space group. The structure consists of eight 02329_fluka molecules inside a MnH4(C2O)5 framework. In the MnH4(C2O)5 framework, there are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 72°. Both Mn(1)-O(2) bond lengths are 2.18 Å. Both Mn(1)-O(4) bond lengths are 2.09 Å. Both Mn(1)-O(5) bond lengths are 2.33 Å. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 72°. Both Mn(2)-O(1) bond lengths are 2.14 Å. Both Mn(2)-O(3) bond lengths are 2.14 Å. Both Mn(2)-O(5) bond lengths are 2.32 Å. There are ten inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(10) and one H(1) atom. The C(1)-C(10) bond length is 1.38 Å. The C(1)-H(1) bond length is 0.93 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(3) and one H(2) atom. The C(2)-C(3) bond length is 1.37 Å. The C(2)-H(2) bond length is 0.93 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(12), one C(2), and one C(4) atom. The C(3)-C(12) bond length is 1.50 Å. The C(3)-C(4) bond length is 1.43 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(9) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-C(9) bond length is 1.43 Å. In the fifth C site, C(5) is bonded in a single-bond geometry to one C(4) and one H(3) atom. The C(5)-H(3) bond length is 0.93 Å. In the sixth C site, C(8) is bonded in a distorted single-bond geometry to one C(9) and one H(6) atom. The C(8)-C(9) bond length is 1.42 Å. The C(8)-H(6) bond length is 0.93 Å. In the seventh C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(4), and one C(8) atom. The C(9)-C(10) bond length is 1.43 Å. In the eighth C site, C(10) is bonded in a trigonal planar geometry to one C(1), one C(11), and one C(9) atom. The C(10)-C(11) bond length is 1.50 Å. In the ninth C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(1), and one O(2) atom. The C(11)-O(1) bond length is 1.25 Å. The C(11)-O(2) bond length is 1.26 Å. In the tenth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(12)-O(3) bond length is 1.26 Å. The C(12)-O(4) bond length is 1.25 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. In the fourth H site, H(6) is bonded in a single-bond geometry to one C(8) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Mn(2) and one C(11) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one C(11) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(2) and one C(12) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(12) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Mn(1) and one Mn(2) atom. Linkers: 4 [O]C(=O)c1ccc(C([O])=O)c2ccccc12. Metal clusters: 4 [Mn]. The MOF has largest included sphere 4.61 A, density 1.08 g/cm3, surface area 4085.34 m2/g, accessible volume 0.49 cm3/g