CdC5N2H5O5 crystallizes in the monoclinic P2_1/c space group. Cd(1) is bonded in a distorted pentagonal pyramidal geometry to one N(1), one O(1), one O(2), one O(3), one O(4), and one O(5) atom. The Cd(1)-N(1) bond length is 2.24 Å. The Cd(1)-O(1) bond length is 2.24 Å. The Cd(1)-O(2) bond length is 2.36 Å. The Cd(1)-O(3) bond length is 2.57 Å. The Cd(1)-O(4) bond length is 2.37 Å. The Cd(1)-O(5) bond length is 2.37 Å. There are five inequivalent C sites. In the first C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(2), and one H(4) atom. The C(3)-C(2) bond length is 1.38 Å. The C(3)-N(2) bond length is 1.37 Å. The C(3)-H(4) bond length is 1.08 Å. In the second C site, C(4) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(5) atom. The C(4)-N(1) bond length is 1.32 Å. The C(4)-N(2) bond length is 1.35 Å. The C(4)-H(5) bond length is 1.08 Å. In the third C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(5) atom. The C(5)-O(4) bond length is 1.27 Å. The C(5)-O(5) bond length is 1.27 Å. In the fourth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(3) atom. The C(1)-C(2) bond length is 1.47 Å. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(3) bond length is 1.28 Å. In the fifth C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one N(1) atom. The C(2)-N(1) bond length is 1.38 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(2), and one C(4) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(3), one C(4), and one H(3) atom. The N(2)-H(3) bond length is 1.04 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(2) atom. The H(1)-O(2) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(2) atom. The H(2)-O(2) bond length is 0.99 Å. In the third H site, H(3) is bonded in a distorted single-bond geometry to one N(2) and one O(3) atom. The H(3)-O(3) bond length is 1.70 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(4) atom. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one C(5) atom. In the second O site, O(5) is bonded in a distorted single-bond geometry to one Cd(1) and one C(5) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cd(1), one C(1), and one H(3) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one Cd(1) and one C(1) atom. In the fifth O site, O(2) is bonded in a distorted water-like geometry to one Cd(1), one H(1), and one H(2) atom. Linkers: 2 [O]C(=O)C([O])=O. Metal clusters: 4 [Cd]. The MOF has largest included sphere 1.71 A, density 2.49 g/cm3, surface area 2975.75 m2/g, accessible volume 0.10 cm3/g