MnH4(CO3)2(CH2)3 crystallizes in the monoclinic P2_1/c space group. The structure consists of twelve 02329_fluka molecules inside a MnH4(CO3)2 framework. In the MnH4(CO3)2 framework, Mn(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Mn(1)-O(1) bond length is 2.10 Å. The Mn(1)-O(2) bond length is 2.12 Å. The Mn(1)-O(3) bond length is 2.36 Å. The Mn(1)-O(4) bond length is 2.22 Å. The Mn(1)-O(5) bond length is 2.11 Å. The Mn(1)-O(6) bond length is 2.33 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.29 Å. In the second C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(5)-O(3) bond length is 1.27 Å. The C(5)-O(4) bond length is 1.29 Å. There are four inequivalent H sites. In the first H site, H(8) is bonded in a distorted single-bond geometry to one O(4) and one O(5) atom. The H(8)-O(4) bond length is 1.67 Å. The H(8)-O(5) bond length is 1.00 Å. In the second H site, H(9) is bonded in a single-bond geometry to one O(6) atom. The H(9)-O(6) bond length is 0.98 Å. In the third H site, H(10) is bonded in a single-bond geometry to one O(6) atom. The H(10)-O(6) bond length is 1.00 Å. In the fourth H site, H(7) is bonded in a distorted linear geometry to one O(3) and one O(5) atom. The H(7)-O(3) bond length is 1.63 Å. The H(7)-O(5) bond length is 1.00 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one C(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Mn(1) and one C(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mn(1), one C(5), and one H(7) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mn(1), one C(5), and one H(8) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one H(7), and one H(8) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one Mn(1), one H(10), and one H(9) atom. Linkers: 4 [O]C(=O)CCCC([O])=O. Metal clusters: 2 O.O.O.O.[C]1O[Mn]2(O1)O[C]O[Mn]1(O[C]O1)O[C]O2. RCSR code: sql. The MOF has largest included sphere 2.09 A, density 1.76 g/cm3, surface area 4047.90 m2/g, accessible volume 0.11 cm3/g