Mg3C24H12O25 is Indium-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is zero-dimensional and consists of two Mg3C24H12O25 clusters. Mg(1) is bonded to one O(3) and four equivalent O(1) atoms to form corner-sharing MgO5 square pyramids. The Mg(1)-O(3) bond length is 1.97 Å. All Mg(1)-O(1) bond lengths are 2.01 Å. There are three inequivalent C sites. In the first C site, C(2) is bonded in a trigonal planar geometry to one C(3) and two equivalent C(1) atoms. The C(2)-C(3) bond length is 1.47 Å. Both C(2)-C(1) bond lengths are 1.40 Å. In the second C site, C(3) is bonded in a bent 120 degrees geometry to one C(2) and two equivalent O(1) atoms. Both C(3)-O(1) bond lengths are 1.26 Å. In the third C site, C(1) is bonded in a distorted single-bond geometry to one C(2) and one O(2) atom. The C(1)-O(2) bond length is 1.35 Å. H(1) is bonded in a single-bond geometry to one O(2) atom. The H(1)-O(2) bond length is 0.82 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Mg(1) and one C(3) atom. In the second O site, O(2) is bonded in a water-like geometry to one C(1) and one H(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to three equivalent Mg(1) atoms. Linkers: 6 [O]C(=O)c1c(O)c(O)c(C([O])=O)c(O)c1O. Metal clusters: 1 O=[C]O[Mg].[C]1O[Mg]O[Mg]O1.[O][C]=O.[O][C]=O.[O][C]=O.[O][C]=O ,1 O=[C]O[Mg].O=[C]O[Mg]O[Mg]O[C]=O.[O][C]=O.[O][C]=O.[O][C]=O. RCSR code: acs. The MOF has largest included sphere 9.66 A, density 0.73 g/cm3, surface area 3869.72 m2/g, accessible volume 1.03 cm3/g