Zn2C18N5H10O8 crystallizes in the monoclinic C2/m space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a distorted square pyramidal geometry to one N(3), two equivalent O(1), and two equivalent O(2) atoms. The Zn(1)-N(3) bond length is 2.01 Å. Both Zn(1)-O(1) bond lengths are 2.03 Å. Both Zn(1)-O(2) bond lengths are 2.07 Å. In the second Zn site, Zn(2) is bonded in a tetrahedral geometry to two equivalent N(1) and two equivalent O(4) atoms. Both Zn(2)-N(1) bond lengths are 1.97 Å. Both Zn(2)-O(4) bond lengths are 1.92 Å. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.51 Å. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.25 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(7) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-C(7) bond length is 1.39 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 1.40 Å. The C(3)-H(3) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(4), and one C(5) atom. The C(4)-C(4) bond length is 1.49 Å. The C(4)-C(5) bond length is 1.39 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 1.38 Å. The C(5)-H(4) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(8) atom. The C(6)-C(7) bond length is 1.39 Å. The C(6)-C(8) bond length is 1.50 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(2), one C(6), and one H(5) atom. The C(7)-H(5) bond length is 0.93 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.23 Å. The C(8)-O(4) bond length is 1.26 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one N(1), one N(2), and one N(3) atom. The C(9)-N(1) bond length is 1.32 Å. The C(9)-N(2) bond length is 1.36 Å. The C(9)-N(3) bond length is 1.35 Å. There are three inequivalent N sites. In the first N site, N(3) is bonded in a distorted trigonal planar geometry to one Zn(1) and two equivalent C(9) atoms. In the second N site, N(1) is bonded in a 2-coordinate geometry to one Zn(2) and one C(9) atom. In the third N site, N(2) is bonded in a distorted trigonal planar geometry to one C(9), one H(1), and one H(2) atom. The N(2)-H(1) bond length is 0.86 Å. The N(2)-H(2) bond length is 0.86 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(2) atom. 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(7) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Zn(1) and one C(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one C(8) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(8) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)cc(-c2cc(C([O])=O)cc(C([O])=O)c2)c1 ,2 NC1=NC(N)=N[N]1 ,2 NC1=NN=C(N)[N]1 ,1 NC1=[N]=C(N=N1)N. Metal clusters: 2 [C]1O[Zn]23O[C]O[Zn](O1)(O[C]O2)O[C]O3 ,2 O=[C]O[Zn]1(O[C]=O)N=N[Zn](O[C]=O)(O[C]=O)N=N1. RCSR code: lvt. The MOF has largest included sphere 8.60 A, density 1.01 g/cm3, surface area 3867.06 m2/g, accessible volume 0.58 cm3/g