CdC9NH7O4 crystallizes in the monoclinic C2/c space group. Cd(1) is bonded in a 5-coordinate geometry to one N(1), two equivalent O(1), and two equivalent O(2) atoms. The Cd(1)-N(1) bond length is 2.33 Å. Both Cd(1)-O(1) bond lengths are 2.47 Å. Both Cd(1)-O(2) bond lengths are 2.26 Å. There are five inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one N(1) atom. The C(1)-C(2) bond length is 1.41 Å. The C(1)-C(4) bond length is 1.50 Å. The C(1)-N(1) bond length is 1.36 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(5) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-C(5) bond length is 1.50 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(1) atom. The C(3)-H(1) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted trigonal non-coplanar geometry to one C(1), one H(2), one H(3), and one H(4) atom. The C(4)-H(2) bond length is 1.09 Å. The C(4)-H(3) bond length is 1.10 Å. The C(4)-H(4) bond length is 1.10 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(5)-O(1) bond length is 1.27 Å. The C(5)-O(2) bond length is 1.28 Å. N(1) is bonded in a trigonal planar geometry to one Cd(1) and two equivalent C(1) atoms. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) 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(4) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cd(1) and one C(5) atom. In the second O site, O(2) is bonded in a water-like geometry to one Cd(1) and one C(5) atom. Linkers: 2 Cc1nc(C)c(C([O])=O)cc1C([O])=O. Metal clusters: 2 [Cd]. The MOF has largest included sphere 1.97 A, density 2.25 g/cm3, surface area 2935.76 m2/g, accessible volume 0.10 cm3/g