MnH4(CO2)4(CH2)2 crystallizes in the orthorhombic P2_12_12_1 space group. The structure consists of eight 02329_fluka molecules inside a MnH4(CO2)4 framework. In the MnH4(CO2)4 framework, Mn(1) is bonded to one O(1), one O(2), one O(5), one O(8), and two equivalent O(4) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 68°. The Mn(1)-O(1) bond length is 2.12 Å. The Mn(1)-O(2) bond length is 2.24 Å. The Mn(1)-O(5) bond length is 2.13 Å. The Mn(1)-O(8) bond length is 2.15 Å. There is one shorter (2.14 Å) and one longer (2.36 Å) Mn(1)-O(4) bond length. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(3) atom. The C(1)-O(2) bond length is 1.28 Å. The C(1)-O(3) bond length is 1.28 Å. In the second C site, C(3) is bonded in a distorted single-bond geometry to one O(1) atom. The C(3)-O(1) bond length is 1.43 Å. In the third C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(5) atom. The C(4)-O(4) bond length is 1.28 Å. The C(4)-O(5) bond length is 1.26 Å. In the fourth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(7) atom. The C(6)-O(6) bond length is 1.32 Å. The C(6)-O(7) bond length is 1.24 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(1) and one O(3) atom. The H(1)-O(1) bond length is 1.02 Å. The H(1)-O(3) bond length is 1.55 Å. In the second H site, H(2) is bonded in a linear geometry to one O(3) and one O(6) atom. The H(2)-O(3) bond length is 1.56 Å. The H(2)-O(6) bond length is 1.03 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(8) atom. The H(3)-O(8) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(8) atom. The H(4)-O(8) bond length is 0.99 Å. There are eight inequivalent O sites. In the first O site, O(2) is bonded in a 2-coordinate geometry to one Mn(1) and one C(1) atom. In the second O site, O(3) is bonded in a trigonal planar geometry to one C(1), one H(1), and one H(2) atom. In the third O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Mn(1) and one C(4) atom. In the fourth O site, O(5) is bonded in a bent 150 degrees geometry to one Mn(1) and one C(4) atom. In the fifth O site, O(6) is bonded in a water-like geometry to one C(6) and one H(2) atom. In the sixth O site, O(7) is bonded in a distorted single-bond geometry to one C(6) atom. In the seventh O site, O(8) is bonded in a distorted water-like geometry to one Mn(1), one H(3), and one H(4) atom. In the eighth O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1), one C(3), and one H(1) atom. Linkers: 4 [O]C(=O)CC(O)(CC(=O)O)C([O])=O. Metal clusters: 4 [Mn]. The MOF has largest included sphere 1.95 A, density 2.07 g/cm3, surface area 3075.61 m2/g, accessible volume 0.11 cm3/g