Zn2C19N4H3O5 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 2.37 Å. The Zn(1)-O(1) bond length is 2.00 Å. Both Zn(1)-O(2) bond lengths are 2.00 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 2.12 Å. Both Zn(2)-O(1) bond lengths are 2.04 Å. There are ten inequivalent C sites. In the first C site, C(1) is bonded in a 3-coordinate geometry to one C(1), one C(2), and one C(8) atom. The C(1)-C(1) bond length is 1.43 Å. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(8) bond length is 1.40 Å. In the second C site, C(2) is bonded in a 3-coordinate geometry to one C(1), one C(2), and one C(9) atom. The C(2)-C(2) bond length is 1.42 Å. The C(2)-C(9) bond length is 1.38 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(4), one C(5), and one C(6) atom. The C(3)-C(4) bond length is 1.47 Å. The C(3)-C(5) bond length is 1.43 Å. The C(3)-C(6) bond length is 1.35 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(2), and one O(3) atom. The C(4)-O(2) bond length is 1.22 Å. The C(4)-O(3) bond length is 1.25 Å. In the fifth C site, C(5) is bonded in a single-bond geometry to one C(3), one C(7), and one H(1) atom. The C(5)-C(7) bond length is 1.36 Å. The C(5)-H(1) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to two equivalent C(3) and one H(2) atom. The C(6)-H(2) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(8) and two equivalent C(5) atoms. The C(7)-C(8) bond length is 1.52 Å. In the eighth C site, C(8) is bonded in a 5-coordinate geometry to one C(7) and four equivalent C(1) atoms. In the ninth C site, C(9) is bonded in a 5-coordinate geometry to one C(10) and four equivalent C(2) atoms. The C(9)-C(10) bond length is 1.48 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(9) and two equivalent N(1) atoms. Both C(10)-N(1) bond lengths are 1.34 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(10), and one N(2) atom. The N(1)-N(2) bond length is 1.35 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 1.23 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(5) 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(4) atom. In the third O site, O(3) is bonded in a single-bond geometry to one C(4) atom. Linkers: 4 [C]12[C]3C14[C]1[C]4[C@]45C67[C@]2([C@]364)[C@@]175.[C]1=NN=N[N]1.[O]C(=O)c1c[c]cc(C([O])=O)c1. Metal clusters: 8 [Zn]. The MOF has largest included sphere 5.31 A, density 1.45 g/cm3, surface area 3305.20 m2/g, accessible volume 0.33 cm3/g