ZnC7NH7O6 crystallizes in the monoclinic C2/c space group. Zn(1) is bonded in a distorted trigonal bipyramidal geometry to one N(1), two equivalent O(1), and two equivalent O(2) atoms. The Zn(1)-N(1) bond length is 2.21 Å. Both Zn(1)-O(1) bond lengths are 2.06 Å. Both Zn(1)-O(2) bond lengths are 2.15 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(2), and one O(3) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-O(2) bond length is 1.28 Å. The C(1)-O(3) bond length is 1.26 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(4) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(4) bond length is 1.40 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one H(3) atom. The C(3)-N(1) bond length is 1.35 Å. The C(3)-H(3) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(4) atom. The C(4)-H(4) bond length is 1.09 Å. N(1) is bonded in a trigonal planar geometry to one Zn(1) and two equivalent C(3) atoms. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) and one O(3) atom. The H(1)-O(1) bond length is 1.00 Å. The H(1)-O(3) bond length is 1.68 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) and one O(2) atom. The H(2)-O(1) bond length is 1.00 Å. The H(2)-O(2) bond length is 1.71 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(4) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one H(1), and one H(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Zn(1), one C(1), and one H(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one C(1) and one H(1) atom. Linkers: 2 [O]C(=O)c1cncc(C([O])=O)c1. Metal clusters: 2 O.O.O=[C]O[Zn]O[C]=O. The MOF has largest included sphere 1.85 A, density 2.11 g/cm3, surface area 3319.47 m2/g, accessible volume 0.06 cm3/g