Zn2C9N4H3O5 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a trigonal bipyramidal geometry to two equivalent N(1), one O(1), and two equivalent O(2) atoms. Both Zn(1)-N(1) bond lengths are 2.36 Å. The Zn(1)-O(1) bond length is 2.01 Å. Both Zn(1)-O(2) bond lengths are 1.96 Å. In the second Zn site, Zn(2) is bonded in a square co-planar geometry to two equivalent N(2) and two equivalent O(1) atoms. Both Zn(2)-N(2) bond lengths are 2.11 Å. Both Zn(2)-O(1) bond lengths are 2.07 Å. There are six inequivalent C sites. In the first C site, C(4) is bonded in a distorted trigonal planar geometry to one C(5) and two equivalent N(1) atoms. The C(4)-C(5) bond length is 1.50 Å. Both C(4)-N(1) bond lengths are 1.33 Å. In the second C site, C(5) is bonded in a trigonal planar geometry to one C(4) and two equivalent C(1) atoms. Both C(5)-C(1) bond lengths are 1.39 Å. In the third C site, C(6) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(2) atom. Both C(6)-C(2) bond lengths are 1.39 Å. The C(6)-H(2) bond length is 0.93 Å. In the fourth C site, C(1) is bonded in a single-bond geometry to one C(2), one C(5), 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(6) atom. The C(2)-C(3) bond length is 1.52 Å. In the sixth C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(2), and one O(3) atom. The C(3)-O(2) bond length is 1.26 Å. The C(3)-O(3) bond length is 1.22 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Zn(1), one C(4), and one N(2) atom. The N(1)-N(2) bond length is 1.34 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Zn(2), one N(1), and one N(2) atom. The N(2)-N(2) bond length is 1.27 Å. There are two 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 single-bond geometry to one C(6) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Zn(1) and two equivalent Zn(2) atoms. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(3) atom. In the third O site, O(3) is bonded in a single-bond geometry to one C(3) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)cc(C2=NN=N[N]2)c1. Metal clusters: 8 [Zn]. The MOF has largest included sphere 5.30 A, density 1.49 g/cm3, surface area 3339.44 m2/g, accessible volume 0.38 cm3/g