ZnC18N5H12O2 crystallizes in the monoclinic P2_1/c space group. Zn(1) is bonded to one N(1), one N(2), one N(4), one N(5), one O(1), and one O(2) atom to form ZnN4O2 octahedra that share  a cornercorner with one C(16)H3O tetrahedra. The Zn(1)-N(1) bond length is 2.06 Å. The Zn(1)-N(2) bond length is 2.08 Å. The Zn(1)-N(4) bond length is 2.11 Å. The Zn(1)-N(5) bond length is 2.13 Å. The Zn(1)-O(1) bond length is 2.38 Å. The Zn(1)-O(2) bond length is 2.16 Å. There are eighteen inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(13), one C(2), and one C(8) atom. The C(1)-C(13) bond length is 1.41 Å. The C(1)-C(2) bond length is 1.48 Å. The C(1)-C(8) bond length is 1.41 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(10), and one C(7) atom. The C(2)-C(10) bond length is 1.39 Å. The C(2)-C(7) bond length is 1.38 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(11) and one N(5) atom. The C(3)-C(11) bond length is 1.38 Å. The C(3)-N(5) bond length is 1.18 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(11), one C(14), and one C(6) atom. The C(4)-C(11) bond length is 1.47 Å. The C(4)-C(14) bond length is 1.41 Å. The C(4)-C(6) bond length is 1.41 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(11) and one N(1) atom. The C(5)-C(11) bond length is 1.38 Å. The C(5)-N(1) bond length is 1.18 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(4) and one H(2) atom. The C(6)-H(2) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a single-bond geometry to one C(2) and one N(4) atom. The C(7)-N(4) bond length is 1.18 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(1) and one H(3,5) atom. The C(8)-H(3,5) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(12), one C(18), and one C(9) atom. The C(9)-C(12) bond length is 1.41 Å. The C(9)-C(18) bond length is 1.41 Å. The C(9)-C(9) bond length is 1.47 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(2) and one N(2) atom. The C(10)-N(2) bond length is 1.18 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(3), one C(4), and one C(5) atom. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(15), one C(9), and one H(4) atom. The C(12)-C(15) bond length is 1.38 Å. The C(12)-H(4) bond length is 1.09 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one C(1) and one H(3,5) atom. The C(13)-H(3,5) bond length is 1.09 Å. In the fourteenth C site, C(14) is bonded in a distorted single-bond geometry to one C(4) and one H(6) atom. The C(14)-H(6) bond length is 1.09 Å. In the fifteenth C site, C(15) is bonded in a distorted trigonal planar geometry to one C(12), one N(3), and one H(7) atom. The C(15)-N(3) bond length is 1.36 Å. The C(15)-H(7) bond length is 1.09 Å. In the sixteenth C site, C(16) is bonded to one H(10), one H(8), one H(9), and one O(1) atom to form CH3O tetrahedra that share  a cornercorner with one Zn(1)N4O2 octahedra. The corner-sharing octahedral tilt angles are 63°. The C(16)-H(10) bond length is 1.10 Å. The C(16)-H(8) bond length is 1.10 Å. The C(16)-H(9) bond length is 1.09 Å. The C(16)-O(1) bond length is 1.44 Å. In the seventeenth C site, C(17) is bonded in a distorted trigonal planar geometry to one C(18), one N(3), and one H(11) atom. The C(17)-C(18) bond length is 1.38 Å. The C(17)-N(3) bond length is 1.36 Å. The C(17)-H(11) bond length is 1.08 Å. In the eighteenth C site, C(18) is bonded in a distorted single-bond geometry to one C(17), one C(9), and one H(12) atom. The C(18)-H(12) bond length is 1.09 Å. There are five inequivalent N sites. In the first N site, N(2) is bonded in a bent 150 degrees geometry to one Zn(1) and one C(10) atom. In the second N site, N(3) is bonded in a trigonal planar geometry to one C(15), one C(17), and one O(2) atom. The N(3)-O(2) bond length is 1.32 Å. In the third N site, N(4) is bonded in a bent 150 degrees geometry to one Zn(1) and one C(7) atom. In the fourth N site, N(5) is bonded in a bent 150 degrees geometry to one Zn(1) and one C(3) atom. In the fifth N site, N(1) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one C(5) atom. There are eleven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one C(6) atom. In the third H site, H(3,5) is bonded in a single-bond geometry to one C(8) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(12) atom. In the fifth H site, H(6) is bonded in a single-bond geometry to one C(14) atom. In the sixth H site, H(7) is bonded in a single-bond geometry to one C(15) atom. In the seventh H site, H(8) is bonded in a single-bond geometry to one C(16) atom. In the eighth H site, H(9) is bonded in a single-bond geometry to one C(16) atom. In the ninth H site, H(10) is bonded in a single-bond geometry to one C(16) atom. In the tenth H site, H(11) is bonded in a single-bond geometry to one C(17) atom. In the eleventh H site, H(12) is bonded in a single-bond geometry to one C(18) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Zn(1), one C(16), and one H(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one N(3) atom. Linkers: 2 [O-][n+]1ccc(-c2cc[n+]([O-])cc2)cc1. Metal clusters: 4 [Zn]. The MOF has largest included sphere 3.47 A, density 1.44 g/cm3, surface area 4568.24 m2/g, accessible volume 0.22 cm3/g