Cd2C20N4H14O9(C3H2O2)2 crystallizes in the monoclinic P2_1/c space group. The structure consists of eight dimethoxymethane molecules inside a Cd2C20N4H14O9 framework. In the Cd2C20N4H14O9 framework, there are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one N(1), one N(4), one O(13), one O(3), one O(6), and one O(7) atom to form corner-sharing CdN2O4 octahedra. The corner-sharing octahedral tilt angles are 70°. The Cd(1)-N(1) bond length is 2.39 Å. The Cd(1)-N(4) bond length is 2.35 Å. The Cd(1)-O(13) bond length is 2.34 Å. The Cd(1)-O(3) bond length is 2.35 Å. The Cd(1)-O(6) bond length is 2.38 Å. The Cd(1)-O(7) bond length is 2.30 Å. In the second Cd site, Cd(2) is bonded to one N(2), one N(3), one O(1), one O(10), one O(12), and one O(13) atom to form corner-sharing CdN2O4 octahedra. The corner-sharing octahedral tilt angles are 70°. The Cd(2)-N(2) bond length is 2.35 Å. The Cd(2)-N(3) bond length is 2.36 Å. The Cd(2)-O(1) bond length is 2.37 Å. The Cd(2)-O(10) bond length is 2.36 Å. The Cd(2)-O(12) bond length is 2.32 Å. The Cd(2)-O(13) bond length is 2.32 Å. There are twenty inequivalent C sites. In the first C site, C(13) is bonded in a distorted bent 120 degrees geometry to one C(14), one O(10), and one O(7) atom. The C(13)-C(14) bond length is 1.51 Å. The C(13)-O(10) bond length is 1.27 Å. The C(13)-O(7) bond length is 1.27 Å. In the second C site, C(14) is bonded in a trigonal planar geometry to one C(13), one C(15), and one C(25) atom. The C(14)-C(15) bond length is 1.40 Å. The C(14)-C(25) bond length is 1.40 Å. In the third C site, C(15) is bonded in a distorted single-bond geometry to one C(14) and one H(8) atom. The C(15)-H(8) bond length is 1.09 Å. In the fourth C site, C(19) is bonded in a distorted single-bond geometry to one C(20) and one H(11) atom. The C(19)-C(20) bond length is 1.40 Å. The C(19)-H(11) bond length is 1.09 Å. In the fifth C site, C(20) is bonded in a trigonal planar geometry to one C(19), one C(21), and one C(23) atom. The C(20)-C(21) bond length is 1.40 Å. The C(20)-C(23) bond length is 1.51 Å. In the sixth C site, C(21) is bonded in a distorted bent 120 degrees geometry to one C(20), one N(2), and one H(12) atom. The C(21)-N(2) bond length is 1.34 Å. The C(21)-H(12) bond length is 1.09 Å. In the seventh C site, C(22) is bonded in a distorted trigonal planar geometry to one N(2) and one H(13) atom. The C(22)-N(2) bond length is 1.34 Å. The C(22)-H(13) bond length is 1.09 Å. In the eighth C site, C(23) is bonded in a distorted bent 120 degrees geometry to one C(20), one O(12), and one O(6) atom. The C(23)-O(12) bond length is 1.27 Å. The C(23)-O(6) bond length is 1.27 Å. In the ninth C site, C(24) is bonded in a distorted bent 120 degrees geometry to one N(4) and one H(14) atom. The C(24)-N(4) bond length is 1.34 Å. The C(24)-H(14) bond length is 1.09 Å. In the tenth C site, C(25) is bonded in a distorted bent 120 degrees geometry to one C(14), one N(4), and one H(15) atom. The C(25)-N(4) bond length is 1.35 Å. The C(25)-H(15) bond length is 1.09 Å. In the eleventh C site, C(26) is bonded in a distorted bent 120 degrees geometry to one C(5), one N(3), and one H(16) atom. The C(26)-C(5) bond length is 1.39 Å. The C(26)-N(3) bond length is 1.34 Å. The C(26)-H(16) bond length is 1.09 Å. In the twelfth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one N(3) and one H(1) atom. The C(1)-N(3) bond length is 1.34 Å. The C(1)-H(1) bond length is 1.09 Å. In the thirteenth C site, C(4) is bonded in a distorted single-bond geometry to one C(5) and one H(4) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-H(4) bond length is 1.09 Å. In the fourteenth C site, C(5) is bonded in a trigonal planar geometry to one C(26), one C(4), and one C(6) atom. The C(5)-C(6) bond length is 1.51 Å. In the fifteenth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(11), and one O(3) atom. The C(6)-O(11) bond length is 1.27 Å. The C(6)-O(3) bond length is 1.27 Å. In the sixteenth C site, C(7) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(5) atom. The C(7)-N(1) bond length is 1.34 Å. The C(7)-H(5) bond length is 1.09 Å. In the seventeenth C site, C(9) is bonded in a distorted single-bond geometry to one C(10) and one H(6) atom. The C(9)-C(10) bond length is 1.40 Å. The C(9)-H(6) bond length is 1.09 Å. In the eighteenth C site, C(10) is bonded in a trigonal planar geometry to one C(11), one C(12), and one C(9) atom. The C(10)-C(11) bond length is 1.51 Å. The C(10)-C(12) bond length is 1.40 Å. In the nineteenth C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(1), and one O(5) atom. The C(11)-O(1) bond length is 1.27 Å. The C(11)-O(5) bond length is 1.27 Å. In the twentieth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(10), one N(1), and one H(7) atom. The C(12)-N(1) bond length is 1.35 Å. The C(12)-H(7) bond length is 1.09 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Cd(1), one C(12), and one C(7) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Cd(2), one C(21), and one C(22) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one Cd(2), one C(1), and one C(26) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Cd(1), one C(24), and one C(25) atom. There are fourteen inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(4) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(5) is bonded in a single-bond geometry to one C(7) atom. In the fourth H site, H(6) is bonded in a single-bond geometry to one C(9) atom. In the fifth H site, H(7) is bonded in a single-bond geometry to one C(12) atom. In the sixth H site, H(8) is bonded in a single-bond geometry to one C(15) atom. In the seventh H site, H(11) is bonded in a single-bond geometry to one C(19) atom. In the eighth H site, H(12) is bonded in a single-bond geometry to one C(21) atom. In the ninth H site, H(13) is bonded in a single-bond geometry to one C(22) atom. In the tenth H site, H(14) is bonded in a single-bond geometry to one C(24) atom. In the eleventh H site, H(15) is bonded in a single-bond geometry to one C(25) atom. In the twelfth H site, H(16) is bonded in a single-bond geometry to one C(26) atom. In the thirteenth H site, H(17) is bonded in a distorted linear geometry to one O(13) and one O(5) atom. The H(17)-O(13) bond length is 1.02 Å. The H(17)-O(5) bond length is 1.57 Å. In the fourteenth H site, H(18) is bonded in a distorted linear geometry to one O(11) and one O(13) atom. The H(18)-O(11) bond length is 1.53 Å. The H(18)-O(13) bond length is 1.04 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cd(2) and one C(11) atom. In the second O site, O(3) is bonded in a bent 120 degrees geometry to one Cd(1) and one C(6) atom. In the third O site, O(5) is bonded in a bent 120 degrees geometry to one C(11) and one H(17) atom. In the fourth O site, O(6) is bonded in a distorted single-bond geometry to one Cd(1) and one C(23) atom. In the fifth O site, O(7) is bonded in a bent 120 degrees geometry to one Cd(1) and one C(13) atom. In the sixth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Cd(1), one Cd(2), one H(17), and one H(18) atom. In the seventh O site, O(10) is bonded in a distorted single-bond geometry to one Cd(2) and one C(13) atom. In the eighth O site, O(11) is bonded in a bent 120 degrees geometry to one C(6) and one H(18) atom. In the ninth O site, O(12) is bonded in a bent 120 degrees geometry to one Cd(2) and one C(23) atom. Linkers: 8 [O]C(=O)c1cncc(OCOc2cncc(C([O])=O)c2)c1. Metal clusters: 4 O.O=[C]O[Cd]1O[C]O[Cd](O[C]=O)O[C]O1. RCSR code: sql. The MOF has largest included sphere 4.52 A, density 1.63 g/cm3, surface area 3653.36 m2/g, accessible volume 0.28 cm3/g