(CuH4(C5O2)2)4OH8 crystallizes in the cubic Fm-3m space group. The structure consists of twenty-four molecular hydrogen;hydrate molecules inside a CuH4(C5O2)2 framework. In the CuH4(C5O2)2 framework, there are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Cu(1)-O(1) bond lengths are 1.96 Å. In the second Cu site, Cu(2) is bonded in a distorted square co-planar geometry to four equivalent O(2) atoms. All Cu(2)-O(2) bond lengths are 1.94 Å. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.53 Å. The C(1)-O(1) bond length is 1.24 Å. The C(1)-O(2) bond length is 1.24 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 1.35 Å. The C(2)-C(4) bond length is 1.38 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(5), and one H(1) atom. The C(3)-C(5) bond length is 1.43 Å. The C(3)-H(1) bond length is 0.95 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(3) atom. The C(4)-H(3) bond length is 0.95 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(6) and two equivalent C(3) atoms. The C(5)-C(6) bond length is 1.43 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(5) and two equivalent C(7) atoms. Both C(6)-C(7) bond lengths are 1.31 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to two equivalent C(6) and one H(4) atom. The C(7)-H(4) bond length is 0.95 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(3) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(4) is bonded in a single-bond geometry to one C(7) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one C(1) atom. Linkers: 32 [O]C(=O)c1cc(C([O])=O)cc(-c2cc(-c3cc(C([O])=O)cc(C([O])=O)c3)cc(-c3cc(C([O])=O)cc(C([O])=O)c3)c2)c1. Metal clusters: 20 O.[C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4.[C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4.[H].[H].[H].[H].[H].[H] ,4 [C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4.[C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4.[H].[H].[H].[H].[H].[H].[H].[OH]. RCSR code: tbo. The MOF has largest included sphere 14.83 A, density 0.86 g/cm3, surface area 3388.86 m2/g, accessible volume 0.81 cm3/g