Er3C24H12O13 crystallizes in the hexagonal P6_3/m space group. Er(1) is bonded in a distorted pentagonal planar geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. The Er(1)-O(3) bond length is 2.29 Å. Both Er(1)-O(1) bond lengths are 2.29 Å. Both Er(1)-O(2) bond lengths are 2.30 Å. There are four inequivalent C sites. In the first C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(2) bond length is 1.37 Å. The C(3)-C(4) bond length is 1.39 Å. The C(3)-H(1) bond length is 0.95 Å. In the second C site, C(4) is bonded in a distorted single-bond geometry to one C(2), one C(3), and one H(2) atom. The C(4)-C(2) bond length is 1.38 Å. The C(4)-H(2) bond length is 0.95 Å. In the third C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.51 Å. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.22 Å. In the fourth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(4) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) atom. There are three inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to three equivalent Er(1) atoms. In the second O site, O(1) is bonded in a 2-coordinate geometry to one Er(1) and one C(1) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Er(1) and one C(1) atom. Linkers: 6 [O]C(=O)c1ccc(C([O])=O)cc1. Metal clusters: 2 [C]1O[Er]23O[C]O[Er]45(O1)O[C]O[Er](O[C]O2)(O[C]O3)(O[C]O4)O5. RCSR code: acs. The MOF has largest included sphere 5.37 A, density 1.83 g/cm3, surface area 2514.76 m2/g, accessible volume 0.25 cm3/g