Cd2C2N5H5S2O8 crystallizes in the triclinic P-1 space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one N(1), one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form distorted CdNO5 octahedra that share corners with two equivalent S(2)O4 tetrahedra, corners with three equivalent S(1)O4 tetrahedra, and  an edgeedge with one Cd(2)NO5 octahedra. The Cd(1)-N(1) bond length is 2.26 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 2.47 Å. The Cd(1)-O(4) bond length is 2.35 Å. The Cd(1)-O(5) bond length is 2.43 Å. In the second Cd site, Cd(2) is bonded to one N(2), one O(4), one O(5), one O(6), and two equivalent O(8) atoms to form distorted CdNO5 octahedra that share corners with two equivalent S(1)O4 tetrahedra, corners with three equivalent S(2)O4 tetrahedra,  an edgeedge with one Cd(1)NO5 octahedra, and  an edgeedge with one Cd(2)NO5 octahedra. The Cd(2)-N(2) bond length is 2.20 Å. The Cd(2)-O(4) bond length is 2.35 Å. The Cd(2)-O(5) bond length is 2.39 Å. The Cd(2)-O(6) bond length is 2.31 Å. There is one shorter (2.32 Å) and one longer (2.34 Å) Cd(2)-O(8) bond length. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one N(4) atom. The C(1)-N(1) bond length is 1.34 Å. The C(1)-N(2) bond length is 1.38 Å. The C(1)-N(4) bond length is 1.34 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(2), one N(3), and one N(5) atom. The C(2)-N(2) bond length is 1.36 Å. The C(2)-N(3) bond length is 1.35 Å. The C(2)-N(5) bond length is 1.34 Å. There are five inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Cd(1), one C(1), and one N(3) atom. The N(1)-N(3) bond length is 1.39 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to one Cd(2), one C(1), and one C(2) atom. In the third N site, N(3) is bonded in a 2-coordinate geometry to one C(2), one N(1), and one H(5) atom. The N(3)-H(5) bond length is 1.03 Å. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one C(1), one H(1), and one H(2) atom. The N(4)-H(1) bond length is 1.02 Å. The N(4)-H(2) bond length is 1.01 Å. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one C(2), one H(3), and one H(4) atom. The N(5)-H(3) bond length is 1.02 Å. The N(5)-H(4) bond length is 1.02 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one N(5) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one N(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one N(3) atom. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form SO4 tetrahedra that share corners with two equivalent Cd(2)NO5 octahedra and corners with three equivalent Cd(1)NO5 octahedra. The corner-sharing octahedral tilt angles range from 44-66°. The S(1)-O(1) bond length is 1.49 Å. The S(1)-O(2) bond length is 1.48 Å. The S(1)-O(5) bond length is 1.51 Å. The S(1)-O(6) bond length is 1.49 Å. In the second S site, S(2) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form SO4 tetrahedra that share corners with two equivalent Cd(1)NO5 octahedra and corners with three equivalent Cd(2)NO5 octahedra. The corner-sharing octahedral tilt angles range from 47-62°. The S(2)-O(3) bond length is 1.49 Å. The S(2)-O(4) bond length is 1.51 Å. The S(2)-O(7) bond length is 1.46 Å. The S(2)-O(8) bond length is 1.50 Å. There are eight 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 distorted bent 120 degrees geometry to one Cd(1) and one S(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cd(1) and one S(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cd(1), one Cd(2), and one S(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Cd(1), one Cd(2), and one S(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Cd(2) and one S(1) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one S(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to two equivalent Cd(2) and one S(2) atom. Linkers: 1 Nc1n[nH]c(N)n1 ,1 N[C]1N=C(N)[N]N1. Metal clusters: 4 [Cd]. The MOF has largest included sphere 1.82 A, density 3.33 g/cm3, surface area 2023.65 m2/g, accessible volume 0.03 cm3/g