U3H12(C3O2)8 is Copper structured and crystallizes in the cubic Fm-3m space group. The structure is zero-dimensional and consists of four U3H12(C3O2)8 clusters. U(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All U(1)-O(1) bond lengths are 2.37 Å. All U(1)-O(2) bond lengths are 2.31 Å. There are three inequivalent C sites. In the first C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(3) and two equivalent O(1) atoms. The C(2)-C(3) bond length is 1.50 Å. Both C(2)-O(1) bond lengths are 1.27 Å. In the second C site, C(3) is bonded in a trigonal planar geometry to one C(2) and two equivalent C(1) atoms. Both C(3)-C(1) bond lengths are 1.42 Å. In the third C site, C(1) is bonded in a single-bond geometry to one C(3) and one H(1) atom. The C(1)-H(1) bond length is 0.96 Å. H(1) is bonded in a single-bond geometry to one C(1) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one U(1) and one C(2) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to three equivalent U(1) atoms. Linkers: 6 [O]C(=O)c1ccc(C([O])=O)cc1. Metal clusters: 1 O=[C]O[U]12(O[C]=O)O[U@@]34O[C]O[U]5O[C]O[U@@](O[C]O3)(O5)O[U]3(O[C]=O)(O[C]=O)(O1)O[U](O[C]=O)(O[C]=O)(O4)(O2)O3.[O][C]=O.[O][C]=O.[O][C]=O. RCSR code: fcu. The MOF has largest included sphere 9.16 A, density 1.69 g/cm3, surface area 2033.77 m2/g, accessible volume 0.31 cm3/g