Cd3C34H36(N15O)2(C5N2H10O)4 crystallizes in the monoclinic P2_1/c space group. The structure consists of eight 1,3-dimethyl-2-imidazolidinone molecules inside a Cd3C34H36(N15O)2 framework. In the Cd3C34H36(N15O)2 framework, there are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to two equivalent N(11), two equivalent N(3), and two equivalent N(8) atoms to form corner-sharing CdN6 octahedra. The corner-sharing octahedral tilt angles are 74°. Both Cd(1)-N(11) bond lengths are 2.36 Å. Both Cd(1)-N(3) bond lengths are 2.33 Å. Both Cd(1)-N(8) bond lengths are 2.35 Å. In the second Cd site, Cd(2) is bonded to one N(1), one N(11), one N(4), one N(6), one N(9), and one O(1) atom to form corner-sharing CdN5O octahedra. The corner-sharing octahedral tilt angles are 74°. The Cd(2)-N(1) bond length is 2.31 Å. The Cd(2)-N(11) bond length is 2.32 Å. The Cd(2)-N(4) bond length is 2.47 Å. The Cd(2)-N(6) bond length is 2.38 Å. The Cd(2)-N(9) bond length is 2.41 Å. The Cd(2)-O(1) bond length is 2.37 Å. There are seventeen inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one H(1) atom. The C(1)-C(2) bond length is 1.39 Å. The C(1)-N(1) bond length is 1.35 Å. The C(1)-H(1) bond length is 1.09 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(2) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-H(2) bond length is 1.09 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(6) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-C(6) bond length is 1.45 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(3) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(3) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one N(1), and one H(4) atom. The C(5)-N(1) bond length is 1.35 Å. The C(5)-H(4) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(3), one N(2), and one N(5) atom. The C(6)-N(2) bond length is 1.35 Å. The C(6)-N(5) bond length is 1.35 Å. In the seventh C site, C(7) is bonded in a distorted trigonal planar geometry to one C(8), one N(6), and one H(5) atom. The C(7)-C(8) bond length is 1.38 Å. The C(7)-N(6) bond length is 1.35 Å. The C(7)-H(5) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(7), one C(9), and one H(6) atom. The C(8)-C(9) bond length is 1.40 Å. The C(8)-H(6) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(12), and one C(8) atom. The C(9)-C(10) bond length is 1.40 Å. The C(9)-C(12) bond length is 1.46 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(11), one C(9), and one H(7) atom. The C(10)-C(11) bond length is 1.39 Å. The C(10)-H(7) bond length is 1.09 Å. In the eleventh C site, C(11) is bonded in a distorted trigonal planar geometry to one C(10), one N(6), and one H(8) atom. The C(11)-N(6) bond length is 1.34 Å. The C(11)-H(8) bond length is 1.09 Å. In the twelfth C site, C(12) is bonded in a distorted water-like geometry to one C(9), one N(10), and one N(7) atom. The C(12)-N(10) bond length is 1.35 Å. The C(12)-N(7) bond length is 1.35 Å. In the thirteenth C site, C(13) is bonded in a trigonal planar geometry to one N(14), one N(15), and one O(1) atom. The C(13)-N(14) bond length is 1.36 Å. The C(13)-N(15) bond length is 1.37 Å. The C(13)-O(1) bond length is 1.26 Å. In the fourteenth C site, C(14) is bonded in a distorted trigonal non-coplanar geometry to one N(15), one H(10), and one H(9) atom. The C(14)-N(15) bond length is 1.46 Å. The C(14)-H(10) bond length is 1.10 Å. The C(14)-H(9) bond length is 1.10 Å. In the fifteenth C site, C(15) is bonded in a distorted trigonal non-coplanar geometry to one N(14), one H(11), and one H(12) atom. The C(15)-N(14) bond length is 1.46 Å. The C(15)-H(11) bond length is 1.10 Å. The C(15)-H(12) bond length is 1.10 Å. In the sixteenth C site, C(16) is bonded in a tetrahedral geometry to one N(15), one H(13), one H(14), and one H(15) atom. The C(16)-N(15) bond length is 1.45 Å. The C(16)-H(13) bond length is 1.10 Å. The C(16)-H(14) bond length is 1.10 Å. The C(16)-H(15) bond length is 1.09 Å. In the seventeenth C site, C(17) is bonded in a tetrahedral geometry to one N(14), one H(16), one H(17), and one H(18) atom. The C(17)-N(14) bond length is 1.45 Å. The C(17)-H(16) bond length is 1.10 Å. The C(17)-H(17) bond length is 1.10 Å. The C(17)-H(18) bond length is 1.10 Å. There are fifteen inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Cd(2), one C(1), and one C(5) atom. In the second N site, N(2) is bonded in a distorted water-like geometry to one C(6) and one N(3) atom. The N(2)-N(3) bond length is 1.33 Å. In the third N site, N(3) is bonded in a trigonal planar geometry to one Cd(1), one N(2), and one N(4) atom. The N(3)-N(4) bond length is 1.34 Å. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Cd(2), one N(3), and one N(5) atom. The N(4)-N(5) bond length is 1.33 Å. In the fifth N site, N(5) is bonded in a distorted water-like geometry to one C(6) and one N(4) atom. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one Cd(2), one C(11), and one C(7) atom. In the seventh N site, N(7) is bonded in a distorted water-like geometry to one C(12) and one N(8) atom. The N(7)-N(8) bond length is 1.32 Å. In the eighth N site, N(8) is bonded in a trigonal planar geometry to one Cd(1), one N(7), and one N(9) atom. The N(8)-N(9) bond length is 1.33 Å. In the ninth N site, N(9) is bonded in a trigonal planar geometry to one Cd(2), one N(10), and one N(8) atom. The N(9)-N(10) bond length is 1.33 Å. In the tenth N site, N(10) is bonded in a distorted water-like geometry to one C(12) and one N(9) atom. In the eleventh N site, N(11) is bonded in a trigonal planar geometry to one Cd(1), one Cd(2), and one N(12) atom. The N(11)-N(12) bond length is 1.21 Å. In the twelfth N site, N(12) is bonded in a linear geometry to one N(11) and one N(13) atom. The N(12)-N(13) bond length is 1.16 Å. In the thirteenth N site, N(13) is bonded in a single-bond geometry to one N(12) atom. In the fourteenth N site, N(14) is bonded in a trigonal planar geometry to one C(13), one C(15), and one C(17) atom. In the fifteenth N site, N(15) is bonded in a trigonal planar geometry to one C(13), one C(14), and one C(16) atom. There are eighteen 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(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) 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. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(8) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(10) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(11) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(14) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(14) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(15) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(15) 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. O(1) is bonded in a distorted bent 150 degrees geometry to one Cd(2) and one C(13) atom. Linkers: 3 c1cc(C2=NN=N[N]2)ccn1 ,5 c1cc(C2=N[N]N=N2)ccn1. Metal clusters: 6 [Cd]. The MOF has largest included sphere 2.80 A, density 1.56 g/cm3, surface area 5086.14 m2/g, accessible volume 0.13 cm3/g