Zn2C9H4O7 crystallizes in the tetragonal P4/mnc space group. Zn(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing ZnO4 trigonal pyramids. The Zn(1)-O(1) bond length is 1.95 Å. The Zn(1)-O(2) bond length is 2.12 Å. The Zn(1)-O(3) bond length is 1.95 Å. The Zn(1)-O(4) bond length is 1.91 Å. There are six inequivalent C sites. In the first C site, C(4) is bonded in a trigonal planar geometry to one C(6) and two equivalent C(1) atoms. The C(4)-C(6) bond length is 1.49 Å. Both C(4)-C(1) bond lengths are 1.39 Å. In the second C site, C(5) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(3) atom. Both C(5)-C(2) bond lengths are 1.39 Å. The C(5)-H(3) bond length is 0.95 Å. In the third C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(4) and two equivalent O(1) atoms. Both C(6)-O(1) bond lengths are 1.25 Å. In the fourth C site, C(1) is bonded in a single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(1)-C(2) bond length is 1.39 Å. The C(1)-H(1) bond length is 0.93 Å. In the fifth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(5) atom. The C(2)-C(3) bond length is 1.50 Å. In the sixth C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one O(2), and one O(3) atom. The C(3)-O(2) bond length is 1.24 Å. The C(3)-O(3) bond length is 1.26 Å. There are three inequivalent H sites. In the first H site, H(2) is bonded in a single-bond geometry to one O(4) atom. The H(2)-O(4) bond length is 0.85 Å. In the second H site, H(3) is bonded in a single-bond geometry to one C(5) atom. In the third H site, H(1) is bonded in a single-bond geometry to one C(1) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Zn(1) and one H(2) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(6) atom. In the third O site, O(2) is bonded in a bent 150 degrees geometry to one Zn(1) and one C(3) atom. In the fourth O site, O(3) is bonded in a water-like geometry to one Zn(1) and one C(3) atom. Linkers: 8 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 2 O[Zn@]12O[C]O[Zn]3O[C]O[Zn]4O[C]O[Zn](O[C]O1)O[C]O[Zn@]1(O)O[C]O[Zn](O[C]O2)O[C]O[Zn@](O)(O[C]O3)O[C]O[Zn@](O)(O[C]O4)O[C]O1. RCSR code: llj. The MOF has largest included sphere 6.88 A, density 1.52 g/cm3, surface area 3036.41 m2/g, accessible volume 0.31 cm3/g