U3C27H9O19 crystallizes in the hexagonal P6_3/m space group. U(1) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. The U(1)-O(4) bond length is 2.23 Å. Both U(1)-O(1) bond lengths are 2.47 Å. Both U(1)-O(2) bond lengths are 2.44 Å. Both U(1)-O(3) bond lengths are 2.42 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(3), and one C(5) atom. The C(1)-C(2) bond length is 1.38 Å. The C(1)-C(3) bond length is 1.49 Å. The C(1)-C(5) bond length is 1.39 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(4), and one H(1) atom. The C(2)-C(4) bond length is 1.42 Å. The C(2)-H(1) bond length is 0.93 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(3) atom. The C(3)-O(1) bond length is 1.24 Å. The C(3)-O(3) bond length is 1.29 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(6) and two equivalent C(2) atoms. The C(4)-C(6) bond length is 1.49 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to two equivalent C(1) and one H(2) atom. The C(5)-H(2) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a bent 120 degrees geometry to one C(4) and two equivalent O(2) atoms. Both C(6)-O(2) bond lengths are 1.27 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) 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 water-like geometry to one U(1) and one C(3) atom. In the second O site, O(2) is bonded in an L-shaped geometry to one U(1) and one C(6) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one U(1) and one C(3) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to three equivalent U(1) atoms. Linkers: 6 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 2 O=[C]O[U]12(O[C]O1)O[C]O[U]13(O[C]=O)(O[C]O1)O[C]O[U]1(O[C]=O)(O[C]O2)(O[C]O1)O3. RCSR code: gfy. The MOF has largest included sphere 13.12 A, density 1.57 g/cm3, surface area 1966.87 m2/g, accessible volume 0.42 cm3/g