Zn9H18(C27O19)2 crystallizes in the cubic I23 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form corner-sharing ZnO4 tetrahedra. The Zn(1)-O(3) bond length is 1.90 Å. The Zn(1)-O(4) bond length is 1.91 Å. The Zn(1)-O(5) bond length is 1.99 Å. The Zn(1)-O(7) bond length is 1.96 Å. In the second Zn site, Zn(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Zn(2)-O(1) bond lengths are 2.00 Å. Both Zn(2)-O(2) bond lengths are 2.06 Å. There are nine 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(4) atom. The C(1)-C(2) bond length is 1.39 Å. The C(1)-C(3) bond length is 1.45 Å. The C(1)-C(4) bond length is 1.41 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(7), and one H(1) atom. The C(2)-C(7) bond length is 1.38 Å. The C(2)-H(1) bond length is 0.95 Å. In the third C site, C(3) is bonded in a bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(3)-O(1) bond length is 1.27 Å. The C(3)-O(2) bond length is 1.26 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(2) atom. The C(4)-C(5) bond length is 1.43 Å. The C(4)-H(2) bond length is 0.95 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(8) atom. The C(5)-C(6) bond length is 1.38 Å. The C(5)-C(8) bond length is 1.48 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(5), one C(7), and one H(3) atom. The C(6)-C(7) bond length is 1.40 Å. The C(6)-H(3) bond length is 0.95 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(9) atom. The C(7)-C(9) bond length is 1.53 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(3), and one O(6) atom. The C(8)-O(3) bond length is 1.23 Å. The C(8)-O(6) bond length is 1.29 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(4), and one O(5) atom. The C(9)-O(4) bond length is 1.27 Å. The C(9)-O(5) bond length is 1.25 Å. There are three 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(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a trigonal non-coplanar geometry to three equivalent Zn(1) atoms. In the second O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Zn(2) and one C(3) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Zn(2) and one C(3) atom. In the fourth O site, O(3) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(8) atom. In the fifth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(9) atom. In the sixth O site, O(5) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(9) atom. In the seventh O site, O(6) is bonded in a single-bond geometry to one C(8) atom. Linkers: 24 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 8 [O][C]O[Zn]1O[C]O[Zn@@]2(O[C][O])O[C]O[Zn@@](O[C][O])(O[C]O1)O2 ,6 [C]1O[Zn]23O[C]O[Zn](O1)(O[C]O2)O[C]O3. RCSR code: idp. The MOF has largest included sphere 13.49 A, density 0.97 g/cm3, surface area 3535.74 m2/g, accessible volume 0.74 cm3/g