ZnC7N3H4O4 crystallizes in the monoclinic P2_1/c space group. Zn(1) is bonded in a distorted tetrahedral geometry to one N(1), one N(2), one N(3), and one O(1) atom. The Zn(1)-N(1) bond length is 2.03 Å. The Zn(1)-N(2) bond length is 2.01 Å. The Zn(1)-N(3) bond length is 2.05 Å. The Zn(1)-O(1) bond length is 1.98 Å. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(3), one C(4), and one H(1) atom. The C(1)-C(3) bond length is 1.40 Å. The C(1)-C(4) bond length is 1.39 Å. The C(1)-H(1) bond length is 1.09 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(1), and one O(2) atom. The C(2)-C(4) bond length is 1.49 Å. The C(2)-O(1) bond length is 1.29 Å. The C(2)-O(2) bond length is 1.27 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(1), one C(4), and one C(7) atom. The C(3)-C(4) bond length is 1.41 Å. The C(3)-C(7) bond length is 1.49 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(3) atom. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(3) atom. The C(5)-N(1) bond length is 1.35 Å. The C(5)-N(2) bond length is 1.33 Å. The C(5)-H(3) bond length is 1.08 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(4) atom. The C(6)-N(1) bond length is 1.35 Å. The C(6)-N(3) bond length is 1.33 Å. The C(6)-H(4) 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(3), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.35 Å. The C(7)-O(4) bond length is 1.22 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Zn(1), one C(5), and one C(6) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(5), and one N(3) atom. The N(2)-N(3) bond length is 1.37 Å. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(6), and one N(2) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a distorted bent 150 degrees geometry to one O(2) and one O(3) atom. The H(2)-O(2) bond length is 1.64 Å. The H(2)-O(3) bond length is 1.01 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(6) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Zn(1) and one C(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one C(2) and one H(2) atom. In the third O site, O(3) is bonded in a water-like geometry to one C(7) and one H(2) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(7) atom. Linkers: 2 [O]C(=O)c1cc(C(=O)O)c(C([O])=O)cc1C(=O)O ,4 [N]1=CN=NC=1. Metal clusters: 2 O=[C]O[Zn]1=NN=[Zn](O[C]=O)N=N1. The MOF has largest included sphere 4.63 A, density 1.37 g/cm3, surface area 3823.13 m2/g, accessible volume 0.36 cm3/g