ZnC7H3O3 crystallizes in the trigonal P3_121 space group. Zn(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(3) atoms to form distorted edge-sharing ZnO5 square pyramids. The Zn(1)-O(2) bond length is 2.00 Å. There is one shorter (2.05 Å) and one longer (2.06 Å) Zn(1)-O(1) bond length. There is one shorter (2.08 Å) and one longer (2.13 Å) Zn(1)-O(3) bond length. There are seven inequivalent C sites. In the first C site, C(3) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(4) atom. The C(3)-C(1) bond length is 1.43 Å. The C(3)-C(2) bond length is 1.47 Å. The C(3)-C(4) bond length is 1.41 Å. In the second C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(1) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(1) bond length is 1.09 Å. In the third C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(5), and one C(7) atom. The C(5)-C(5) bond length is 1.47 Å. The C(5)-C(7) bond length is 1.41 Å. In the fourth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(1), one C(7), and one H(2) atom. The C(6)-C(1) bond length is 1.41 Å. The C(6)-C(7) bond length is 1.38 Å. The C(6)-H(2) bond length is 1.09 Å. In the fifth C site, C(1) is bonded in a single-bond geometry to one C(3), one C(6), and one O(1) atom. The C(1)-O(1) bond length is 1.35 Å. In the sixth C site, C(7) is bonded in a distorted trigonal planar geometry to one C(5), one C(6), and one H(3) atom. The C(7)-H(3) bond length is 1.09 Å. In the seventh C site, C(2) is bonded in a bent 120 degrees geometry to one C(3), one O(2), and one O(3) atom. The C(2)-O(2) bond length is 1.28 Å. The C(2)-O(3) bond length is 1.29 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(6) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(7) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Zn(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Zn(1) and one C(2) atom. Linkers: 3 [O]C(=O)c1cc(-c2ccc([O])c(C([O])=O)c2)ccc1[O]. Metal clusters: 6 [Zn]. The MOF has largest included sphere 16.35 A, density 0.72 g/cm3, surface area 3198.64 m2/g, accessible volume 1.14 cm3/g