Zn2C7NH5O6 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 5-coordinate geometry to one N(1), one O(5), one O(6), and two equivalent O(1) atoms. The Zn(1)-N(1) bond length is 2.08 Å. The Zn(1)-O(5) bond length is 1.97 Å. The Zn(1)-O(6) bond length is 2.10 Å. There is one shorter (2.05 Å) and one longer (2.44 Å) Zn(1)-O(1) bond length. In the second Zn site, Zn(2) is bonded to one O(4), one O(5), and two equivalent O(6) atoms to form corner-sharing ZnO4 tetrahedra. The Zn(2)-O(4) bond length is 1.96 Å. The Zn(2)-O(5) bond length is 1.92 Å. There is one shorter (1.99 Å) and one longer (2.06 Å) Zn(2)-O(6) bond length. There are seven 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(1), and one O(2) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-O(1) bond length is 1.31 Å. The C(1)-O(2) bond length is 1.24 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one N(1) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-N(1) bond length is 1.36 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(3) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-H(3) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(7) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-C(7) bond length is 1.51 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(4), one C(6), and one H(4) atom. The C(5)-C(6) bond length is 1.40 Å. The C(5)-H(4) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(5), one N(1), and one H(5) atom. The C(6)-N(1) bond length is 1.35 Å. The C(6)-H(5) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.25 Å. The C(7)-O(4) bond length is 1.29 Å. N(1) is bonded in a trigonal planar geometry to one Zn(1), one C(2), and one C(6) atom. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. The H(2)-O(6) bond length is 1.00 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(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Zn(1) and one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one C(7) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(7) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one Zn(2), and one H(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Zn(1), two equivalent Zn(2), and one H(2) atom. Linkers: 4 [O]C(=O)c1ccnc(C([O])=O)c1. Metal clusters: 8 [Zn]. The MOF has largest included sphere 1.77 A, density 2.41 g/cm3, surface area 3184.24 m2/g, accessible volume 0.07 cm3/g