CdC7N4H8SO5 crystallizes in the monoclinic P2_1 space group. Cd(1) is bonded to one N(1), one N(4), one O(1), one O(3), one O(4), and one O(5) atom to form CdN2O4 octahedra that share corners with three equivalent S(1)O4 tetrahedra. The Cd(1)-N(1) bond length is 2.35 Å. The Cd(1)-N(4) bond length is 2.32 Å. The Cd(1)-O(1) bond length is 2.32 Å. The Cd(1)-O(3) bond length is 2.37 Å. The Cd(1)-O(4) bond length is 2.41 Å. The Cd(1)-O(5) bond length is 2.31 Å. There are seven 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(3) 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(3) 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) and one H(4) atom. The C(2)-H(4) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(4) and one H(5) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(5) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one N(2) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-N(2) bond length is 1.42 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(6) atom. The C(5)-N(1) bond length is 1.34 Å. The C(5)-H(6) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one N(2), one N(3), and one H(7) atom. The C(6)-N(2) bond length is 1.38 Å. The C(6)-N(3) bond length is 1.31 Å. The C(6)-H(7) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one N(2), one N(4), and one H(8) atom. The C(7)-N(2) bond length is 1.37 Å. The C(7)-N(4) bond length is 1.32 Å. The C(7)-H(8) 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(1), and one C(5) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(7) atom. In the third N site, N(3) is bonded in a distorted water-like geometry to one C(6) and one N(4) atom. The N(3)-N(4) bond length is 1.38 Å. In the fourth N site, N(4) is bonded in a 3-coordinate geometry to one Cd(1), one C(7), and one N(3) atom. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) and one O(5) atom. The H(1)-O(4) bond length is 1.74 Å. The H(1)-O(5) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(3) and one O(5) atom. The H(2)-O(3) bond length is 1.70 Å. The H(2)-O(5) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(1) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(2) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(3) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(5) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(6) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(7) atom. S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share corners with three equivalent Cd(1)N2O4 octahedra. The corner-sharing octahedral tilt angles range from 42-52°. The S(1)-O(1) bond length is 1.49 Å. The S(1)-O(2) bond length is 1.46 Å. The S(1)-O(3) bond length is 1.51 Å. The S(1)-O(4) bond length is 1.51 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Cd(1) and one S(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one S(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Cd(1), one H(2), and one S(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Cd(1), one H(1), and one S(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Cd(1), one H(1), and one H(2) atom. Linkers: 2 c1cncc(-n2cnnc2)c1. Metal clusters: 2 [Cd]. The MOF has largest included sphere 1.68 A, density 2.29 g/cm3, surface area 3222.23 m2/g, accessible volume 0.07 cm3/g