Zn2C18N3H11O7 crystallizes in the monoclinic C2/c space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent O(1), two equivalent O(5), and two equivalent O(7) atoms to form ZnO6 octahedra that share corners with two equivalent Zn(2)NO3 tetrahedra and  an edgeedge with one Zn(3)O4 tetrahedra. Both Zn(1)-O(1) bond lengths are 2.10 Å. Both Zn(1)-O(5) bond lengths are 2.07 Å. Both Zn(1)-O(7) bond lengths are 2.17 Å. In the second Zn site, Zn(2) is bonded to one N(3), one O(2), one O(6), and one O(7) atom to form ZnNO3 tetrahedra that share  a cornercorner with one Zn(1)O6 octahedra and  a cornercorner with one Zn(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 81°. The Zn(2)-N(3) bond length is 1.99 Å. The Zn(2)-O(2) bond length is 1.99 Å. The Zn(2)-O(6) bond length is 1.95 Å. The Zn(2)-O(7) bond length is 1.97 Å. In the third Zn site, Zn(3) is bonded to two equivalent O(3) and two equivalent O(7) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(2)NO3 tetrahedra and  an edgeedge with one Zn(1)O6 octahedra. Both Zn(3)-O(3) bond lengths are 1.93 Å. Both Zn(3)-O(7) bond lengths are 2.02 Å. There are eighteen inequivalent C sites. In the first C site, C(7) is bonded in a trigonal planar geometry to one C(10), one C(6), and one C(8) atom. The C(7)-C(10) bond length is 1.51 Å. The C(7)-C(6) bond length is 1.40 Å. The C(7)-C(8) bond length is 1.40 Å. In the second C site, C(8) is bonded in a distorted trigonal planar geometry to one C(3), one C(7), and one H(4) atom. The C(8)-C(3) bond length is 1.39 Å. The C(8)-H(4) bond length is 1.09 Å. In the third C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(1), and one O(2) atom. The C(9)-C(5) bond length is 1.50 Å. The C(9)-O(1) bond length is 1.26 Å. The C(9)-O(2) bond length is 1.29 Å. In the fourth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(3), and one O(4) atom. The C(10)-O(3) bond length is 1.30 Å. The C(10)-O(4) bond length is 1.25 Å. In the fifth C site, C(11) is bonded in a trigonal planar geometry to one C(1), one C(12), and one C(16) atom. The C(11)-C(1) bond length is 1.46 Å. The C(11)-C(12) bond length is 1.41 Å. The C(11)-C(16) bond length is 1.40 Å. In the sixth C site, C(12) is bonded in a distorted trigonal planar geometry to one C(11), one C(13), and one H(5) atom. The C(12)-C(13) bond length is 1.39 Å. The C(12)-H(5) bond length is 1.09 Å. In the seventh C site, C(13) is bonded in a distorted trigonal planar geometry to one C(12), one C(14), and one H(6) atom. The C(13)-C(14) bond length is 1.40 Å. The C(13)-H(6) bond length is 1.09 Å. In the eighth C site, C(14) is bonded in a trigonal planar geometry to one C(13), one C(15), and one C(17) atom. The C(14)-C(15) bond length is 1.40 Å. The C(14)-C(17) bond length is 1.50 Å. In the ninth C site, C(15) is bonded in a distorted single-bond geometry to one C(14) and one H(7) atom. The C(15)-H(7) bond length is 1.09 Å. In the tenth C site, C(16) is bonded in a distorted single-bond geometry to one C(11) and one H(8) atom. The C(16)-H(8) bond length is 1.09 Å. In the eleventh C site, C(17) is bonded in a distorted bent 120 degrees geometry to one C(14), one O(5), and one O(6) atom. The C(17)-O(5) bond length is 1.26 Å. The C(17)-O(6) bond length is 1.29 Å. In the twelfth C site, C(18) is bonded in a distorted trigonal non-coplanar geometry to one C(2), one H(10), one H(11), and one H(9) atom. The C(18)-C(2) bond length is 1.48 Å. The C(18)-H(10) bond length is 1.10 Å. The C(18)-H(11) bond length is 1.10 Å. The C(18)-H(9) bond length is 1.10 Å. In the thirteenth C site, C(1) is bonded in a distorted trigonal planar geometry to one C(11), one N(1), and one N(2) atom. The C(1)-N(1) bond length is 1.39 Å. The C(1)-N(2) bond length is 1.32 Å. In the fourteenth C site, C(2) is bonded in a distorted trigonal planar geometry to one C(18), one N(1), and one N(3) atom. The C(2)-N(1) bond length is 1.37 Å. The C(2)-N(3) bond length is 1.33 Å. In the fifteenth C site, C(3) is bonded in a distorted trigonal planar geometry to one C(4), one C(8), and one N(1) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-N(1) bond length is 1.44 Å. In the sixteenth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one H(2) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-H(2) bond length is 1.09 Å. In the seventeenth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(9) atom. The C(5)-C(6) bond length is 1.40 Å. In the eighteenth C site, C(6) is bonded in a distorted single-bond geometry to one C(5), one C(7), and one H(3) atom. The C(6)-H(3) bond length is 1.09 Å. There are three inequivalent N sites. In the first N site, N(3) is bonded in a 3-coordinate geometry to one Zn(2), one C(2), and one N(2) atom. The N(3)-N(2) bond length is 1.37 Å. In the second N site, N(1) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(3) atom. In the third N site, N(2) is bonded in a distorted water-like geometry to one C(1) and one N(3) atom. There are eleven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. The H(1)-O(7) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(8) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(12) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(13) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(15) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(16) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(18) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(18) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(18) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one C(9) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(9) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Zn(3) and one C(10) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(10) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one C(17) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(17) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Zn(1), one Zn(2), one Zn(3), and one H(1) atom. Linkers: 4 Cc1nnc(-c2ccc(C([O])=O)cc2)n1-c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 2 O=[C]O[Zn]O[C]=O.O[Zn]1O[C]O[Zn]2(O[C]O1)O[C]O[Zn](O)O[C]O2. RCSR code: ant. The MOF has largest included sphere 3.82 A, density 1.60 g/cm3, surface area 3703.32 m2/g, accessible volume 0.18 cm3/g