CdC8H4O5 crystallizes in the cubic Ia-3 space group. Cd(1) is bonded to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form corner-sharing CdO6 octahedra. The corner-sharing octahedral tilt angles are 78°. The Cd(1)-O(1) bond length is 2.23 Å. The Cd(1)-O(3) bond length is 2.43 Å. The Cd(1)-O(4) bond length is 2.35 Å. The Cd(1)-O(5) bond length is 2.21 Å. Both Cd(1)-O(2) bond lengths are 2.32 Å. There are eight inequivalent C sites. In the first C site, C(3) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one H(1) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-C(6) bond length is 1.39 Å. The C(3)-H(1) bond length is 1.09 Å. In the second C site, C(4) is bonded in a distorted trigonal planar geometry to one C(2), one C(3), and one H(2) atom. The C(4)-C(2) bond length is 1.40 Å. The C(4)-H(2) bond length is 1.09 Å. In the third C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(4), and one O(5) atom. The C(7)-C(2) bond length is 1.49 Å. The C(7)-O(4) bond length is 1.30 Å. The C(7)-O(5) bond length is 1.26 Å. In the fourth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(1), and one O(2) atom. The C(8)-C(5) bond length is 1.49 Å. The C(8)-O(1) bond length is 1.27 Å. The C(8)-O(2) bond length is 1.29 Å. In the fifth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(4), and one C(7) atom. The C(2)-C(1) bond length is 1.42 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one H(3) atom. The C(6)-C(5) bond length is 1.41 Å. The C(6)-H(3) bond length is 1.09 Å. In the seventh C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(5), and one O(3) atom. The C(1)-C(5) bond length is 1.41 Å. The C(1)-O(3) bond length is 1.36 Å. In the eighth C site, C(5) is bonded in a trigonal planar geometry to one C(1), one C(6), and one C(8) atom. There are four inequivalent H sites. In the first H site, H(3) is bonded in a single-bond geometry to one C(6) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(4) is bonded in a bent 150 degrees geometry to one O(3) and one O(4) atom. The H(4)-O(3) bond length is 1.05 Å. The H(4)-O(4) bond length is 1.47 Å. There are five inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to one Cd(1), one C(1), and one H(4) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Cd(1) and one C(8) atom. In the third O site, O(4) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(7), and one H(4) atom. In the fourth O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one C(8) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Cd(1) and one C(7) atom. Linkers: 24 [O]C(=O)c1cccc(C([O])=O)c1O. Metal clusters: 4 O[Cd]123O[C]O[Cd]4(O)(O[C]O1)O[C]O[Cd]1(O)(O[C]O4)O[C]O[Cd]4(O)(O[C]O1)O[C]O[Cd]1(O)(O[C]O[Cd](O)(O[C]O2)(O[C]O3)O[C]O1)O[C]O4. RCSR code: pcu. The MOF has largest included sphere 5.25 A, density 1.92 g/cm3, surface area 2976.25 m2/g, accessible volume 0.20 cm3/g