CdC9NH7O7 crystallizes in the monoclinic P2_1/c space group. Cd(1) is bonded in a 5-coordinate geometry to one N(1), one O(5), one O(7), and two equivalent O(1) atoms. The Cd(1)-N(1) bond length is 2.32 Å. The Cd(1)-O(5) bond length is 2.33 Å. The Cd(1)-O(7) bond length is 2.29 Å. There is one shorter (2.30 Å) and one longer (2.35 Å) Cd(1)-O(1) bond length. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.49 Å. The C(1)-O(1) bond length is 1.29 Å. The C(1)-O(2) bond length is 1.25 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(6) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-C(6) bond length is 1.40 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one H(4) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-H(4) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(7) atom. The C(4)-C(5) bond length is 1.42 Å. The C(4)-C(7) bond length is 1.49 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(8), and one N(1) atom. The C(5)-C(8) bond length is 1.49 Å. The C(5)-N(1) bond length is 1.35 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(2), one C(9), and one N(1) atom. The C(6)-C(9) bond length is 1.52 Å. The C(6)-N(1) bond length is 1.35 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.32 Å. The C(7)-O(4) bond length is 1.24 Å. In the eighth C site, C(8) is bonded in a distorted trigonal non-coplanar geometry to one C(5), one H(5), one H(6), and one H(7) atom. The C(8)-H(5) bond length is 1.09 Å. The C(8)-H(6) bond length is 1.10 Å. The C(8)-H(7) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(5), and one O(6) atom. The C(9)-O(5) bond length is 1.29 Å. The C(9)-O(6) bond length is 1.25 Å. N(1) is bonded in a trigonal planar geometry to one Cd(1), one C(5), and one C(6) atom. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(3) and one O(5) atom. The H(1)-O(3) bond length is 1.05 Å. The H(1)-O(5) bond length is 1.50 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(4) and one O(7) atom. The H(2)-O(4) bond length is 1.69 Å. The H(2)-O(7) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(7) atom. The H(3)-O(7) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(3) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(8) 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(8) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Cd(1) and one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(1) atom. In the third O site, O(3) is bonded in a water-like geometry to one C(7) and one H(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one C(7) and one H(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(9), and one H(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one C(9) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Cd(1), one H(2), and one H(3) atom. Linkers: 3 Cc1nc(C([O])=O)c(C([O])=O)cc1C(=O)O. Metal clusters: 4 [Cd]. The MOF has largest included sphere 2.66 A, density 2.21 g/cm3, surface area 3085.67 m2/g, accessible volume 0.07 cm3/g