UC5HO4 crystallizes in the orthorhombic Pbcn space group. U(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(4) atom. The U(1)-O(1) bond length is 2.44 Å. The U(1)-O(2) bond length is 2.43 Å. The U(1)-O(3) bond length is 2.39 Å. The U(1)-O(4) bond length is 2.34 Å. There are five inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(1), and one O(4) atom. The C(1)-C(4) bond length is 1.50 Å. The C(1)-O(1) bond length is 1.25 Å. The C(1)-O(4) bond length is 1.26 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(2), and one O(3) atom. The C(2)-C(3) bond length is 1.51 Å. The C(2)-O(2) bond length is 1.26 Å. The C(2)-O(3) bond length is 1.25 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(5) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-C(5) bond length is 1.39 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(5) atom. The C(4)-C(5) bond length is 1.39 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(3), one C(4), and one H(1) atom. The C(5)-H(1) bond length is 0.93 Å. H(1) is bonded in a single-bond geometry to one C(5) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one U(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one U(1) and one C(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one U(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one U(1) and one C(1) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 8 [U]. The MOF has largest included sphere 4.42 A, density 2.96 g/cm3, surface area 1789.00 m2/g, accessible volume 0.15 cm3/g