UH4(CO4)2(CH)2 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four 02329_fluka molecules and two UH4(CO4)2 clusters. In each UH4(CO4)2 cluster, U(1) is bonded in a distorted linear geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both U(1)-O(1) bond lengths are 1.81 Å. Both U(1)-O(2) bond lengths are 2.52 Å. Both U(1)-O(3) bond lengths are 2.46 Å. Both U(1)-O(4) bond lengths are 2.45 Å. 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 1.27 Å. The C(1)-O(3) bond length is 1.29 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(4) atom. The H(1)-O(4) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(4) atom. The H(2)-O(4) bond length is 0.98 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted water-like geometry to one U(1), one H(1), and one H(2) atom. In the second O site, O(1) is bonded in a single-bond geometry to one U(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one U(1) and one C(1) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one U(1) and one C(1) atom. Linkers: 1 [O]C(=O)/C=C/C([O])=O. Metal clusters: 2 O.O.[O][U](=O)(O[C]=O)O[C]=O. The MOF has largest included sphere 1.45 A, density 3.47 g/cm3, surface area 2258.46 m2/g, accessible volume 0.06 cm3/g