Zn2C18NH21O9 crystallizes in the orthorhombic P2_12_12_1 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(7), and one O(9) atom. The Zn(1)-O(1) bond length is 1.96 Å. The Zn(1)-O(3) bond length is 1.97 Å. The Zn(1)-O(7) bond length is 1.96 Å. The Zn(1)-O(9) bond length is 2.00 Å. In the second Zn site, Zn(2) is bonded in a 5-coordinate geometry to one O(2), one O(4), one O(5), one O(6), and one O(8) atom. The Zn(2)-O(2) bond length is 2.00 Å. The Zn(2)-O(4) bond length is 1.99 Å. The Zn(2)-O(5) bond length is 2.02 Å. The Zn(2)-O(6) bond length is 2.36 Å. The Zn(2)-O(8) bond length is 2.00 Å. There are eighteen inequivalent C sites. In the first C site, C(10) is bonded in a distorted water-like geometry to one C(5), one C(7), one H(3), and one H(4) atom. The C(10)-C(5) bond length is 1.53 Å. The C(10)-C(7) bond length is 1.54 Å. The C(10)-H(3) bond length is 1.10 Å. The C(10)-H(4) bond length is 1.10 Å. In the second C site, C(11) is bonded in a distorted water-like geometry to one C(5), one C(8), one H(5), and one H(6) atom. The C(11)-C(5) bond length is 1.55 Å. The C(11)-C(8) bond length is 1.53 Å. The C(11)-H(5) bond length is 1.10 Å. The C(11)-H(6) bond length is 1.10 Å. In the third C site, C(12) is bonded in a distorted water-like geometry to one C(6), one C(7), one H(7), and one H(8) atom. The C(12)-C(6) bond length is 1.55 Å. The C(12)-C(7) bond length is 1.54 Å. The C(12)-H(7) bond length is 1.10 Å. The C(12)-H(8) bond length is 1.10 Å. In the fourth C site, C(13) is bonded in a distorted water-like geometry to one C(6), one C(8), one H(10), and one H(9) atom. The C(13)-C(6) bond length is 1.54 Å. The C(13)-C(8) bond length is 1.54 Å. The C(13)-H(10) bond length is 1.10 Å. The C(13)-H(9) bond length is 1.10 Å. In the fifth C site, C(14) is bonded in a distorted water-like geometry to one C(7), one C(8), one H(11), and one H(12) atom. The C(14)-C(7) bond length is 1.55 Å. The C(14)-C(8) bond length is 1.55 Å. The C(14)-H(11) bond length is 1.10 Å. The C(14)-H(12) bond length is 1.10 Å. In the sixth C site, C(15) is bonded in a distorted trigonal planar geometry to one C(16), one N(1), and one O(9) atom. The C(15)-C(16) bond length is 1.50 Å. The C(15)-N(1) bond length is 1.34 Å. The C(15)-O(9) bond length is 1.28 Å. In the seventh C site, C(16) is bonded in a distorted trigonal non-coplanar geometry to one C(15), one H(13), one H(14), and one H(15) atom. The C(16)-H(13) bond length is 1.09 Å. The C(16)-H(14) bond length is 1.10 Å. The C(16)-H(15) bond length is 1.10 Å. In the eighth C site, C(17) is bonded to one N(1), one H(16), one H(17), and one H(18) atom to form corner-sharing CH3N tetrahedra. The C(17)-N(1) bond length is 1.47 Å. The C(17)-H(16) bond length is 1.09 Å. The C(17)-H(17) bond length is 1.10 Å. The C(17)-H(18) bond length is 1.10 Å. In the ninth C site, C(18) is bonded to one N(1), one H(19), one H(20), and one H(21) atom to form corner-sharing CH3N tetrahedra. The C(18)-N(1) bond length is 1.46 Å. The C(18)-H(19) bond length is 1.10 Å. The C(18)-H(20) bond length is 1.09 Å. The C(18)-H(21) bond length is 1.10 Å. In the tenth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(1), and one O(2) atom. The C(1)-C(5) bond length is 1.52 Å. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.27 Å. In the eleventh C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(3), and one O(4) atom. The C(2)-C(6) bond length is 1.52 Å. The C(2)-O(3) bond length is 1.29 Å. The C(2)-O(4) bond length is 1.27 Å. In the twelfth C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(5), and one O(6) atom. The C(3)-C(7) bond length is 1.53 Å. The C(3)-O(5) bond length is 1.30 Å. The C(3)-O(6) bond length is 1.26 Å. In the thirteenth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(7), and one O(8) atom. The C(4)-C(8) bond length is 1.53 Å. The C(4)-O(7) bond length is 1.29 Å. The C(4)-O(8) bond length is 1.26 Å. In the fourteenth C site, C(5) is bonded to one C(1), one C(10), one C(11), and one C(9) atom to form corner-sharing CC4 tetrahedra. The C(5)-C(9) bond length is 1.53 Å. In the fifteenth C site, C(6) is bonded to one C(12), one C(13), one C(2), and one C(9) atom to form corner-sharing CC4 tetrahedra. The C(6)-C(9) bond length is 1.54 Å. In the sixteenth C site, C(7) is bonded to one C(10), one C(12), one C(14), and one C(3) atom to form corner-sharing CC4 tetrahedra. In the seventeenth C site, C(8) is bonded to one C(11), one C(13), one C(14), and one C(4) atom to form corner-sharing CC4 tetrahedra. In the eighteenth C site, C(9) is bonded in a distorted water-like geometry to one C(5), one C(6), one H(1), and one H(2) atom. The C(9)-H(1) bond length is 1.10 Å. The C(9)-H(2) bond length is 1.10 Å. N(1) is bonded in a trigonal planar geometry to one C(15), one C(17), and one C(18) atom. There are twenty-one inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(9) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(9) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(10) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(10) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(11) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(11) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(12) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(12) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(13) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(13) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(14) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(14) atom. In the thirteenth H site, H(13) is bonded in a single-bond geometry to one C(16) atom. In the fourteenth H site, H(14) is bonded in a single-bond geometry to one C(16) atom. In the fifteenth H site, H(15) is bonded in a single-bond geometry to one C(16) atom. In the sixteenth H site, H(16) is bonded in a single-bond geometry to one C(17) atom. In the seventeenth H site, H(17) is bonded in a single-bond geometry to one C(17) atom. In the eighteenth H site, H(18) is bonded in a single-bond geometry to one C(17) atom. In the nineteenth H site, H(19) is bonded in a single-bond geometry to one C(18) atom. In the twentieth H site, H(20) is bonded in a single-bond geometry to one C(18) atom. In the twenty-first H site, H(21) is bonded in a single-bond geometry to one C(18) atom. There are nine 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 120 degrees geometry to one Zn(2) and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(2) atom. In the fifth O site, O(5) is bonded in an L-shaped geometry to one Zn(2) and one C(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Zn(2) and one C(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(4) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Zn(2) and one C(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(15) atom. Linkers: 4 [O]C(=O)[C@]12C[C@]3(C([O])=O)C[C@](C([O])=O)(C1)C[C@](C([O])=O)(C2)C3. Metal clusters: 8 [Zn]. The MOF has largest included sphere 5.11 A, density 1.37 g/cm3, surface area 4177.40 m2/g, accessible volume 0.37 cm3/g