Cd2C19N4H3O5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a distorted octahedral geometry to two equivalent N(1), one O(1), one O(2), one O(3), and one O(5) atom. Both Cd(1)-N(1) bond lengths are 2.51 Å. The Cd(1)-O(1) bond length is 2.36 Å. The Cd(1)-O(2) bond length is 2.35 Å. The Cd(1)-O(3) bond length is 2.19 Å. The Cd(1)-O(5) bond length is 2.25 Å. In the second Cd site, Cd(2) is bonded in a square co-planar geometry to two equivalent N(2) and two equivalent O(5) atoms. Both Cd(2)-N(2) bond lengths are 2.37 Å. Both Cd(2)-O(5) bond lengths are 2.20 Å. There are fifteen inequivalent C sites. In the first C site, C(1) is bonded in a 3-coordinate geometry to one C(15), one C(2), and one C(4) atom. The C(1)-C(15) bond length is 1.44 Å. The C(1)-C(2) bond length is 1.34 Å. The C(1)-C(4) bond length is 1.42 Å. In the second C site, C(2) is bonded in a 3-coordinate geometry to one C(1), one C(15), and one C(3) atom. The C(2)-C(15) bond length is 1.34 Å. The C(2)-C(3) bond length is 1.41 Å. In the third C site, C(3) is bonded in a 4-coordinate geometry to one C(10), one C(2), one C(3), and one C(4) atom. The C(3)-C(10) bond length is 1.31 Å. The C(3)-C(3) bond length is 1.75 Å. The C(3)-C(4) bond length is 1.38 Å. In the fourth C site, C(4) is bonded in a 3-coordinate geometry to one C(1), one C(10), and one C(3) atom. The C(4)-C(10) bond length is 1.46 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(15) and two equivalent N(1) atoms. The C(5)-C(15) bond length is 1.48 Å. Both C(5)-N(1) bond lengths are 1.34 Å. In the sixth C site, C(6) is bonded in a bent 120 degrees geometry to one C(7), one O(1), and one O(2) atom. The C(6)-C(7) bond length is 1.51 Å. The C(6)-O(1) bond length is 1.26 Å. The C(6)-O(2) bond length is 1.25 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(14), one C(6), and one C(8) atom. The C(7)-C(14) bond length is 1.39 Å. The C(7)-C(8) bond length is 1.38 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(7), one C(9), and one H(1) atom. The C(8)-C(9) bond length is 1.39 Å. The C(8)-H(1) bond length is 0.93 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(13), and one C(8) atom. The C(9)-C(10) bond length is 1.49 Å. The C(9)-C(13) bond length is 1.38 Å. In the tenth C site, C(10) is bonded in a 5-coordinate geometry to one C(9), two equivalent C(3), and two equivalent C(4) atoms. In the eleventh C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(3), and one O(4) atom. The C(11)-C(12) bond length is 1.54 Å. The C(11)-O(3) bond length is 1.26 Å. The C(11)-O(4) bond length is 1.22 Å. In the twelfth C site, C(12) is bonded in a trigonal planar geometry to one C(11), one C(13), and one C(14) atom. The C(12)-C(13) bond length is 1.36 Å. The C(12)-C(14) bond length is 1.36 Å. In the thirteenth C site, C(13) is bonded in a single-bond geometry to one C(12), one C(9), and one H(2) atom. The C(13)-H(2) bond length is 0.93 Å. In the fourteenth C site, C(14) is bonded in a distorted single-bond geometry to one C(12), one C(7), and one H(3) atom. The C(14)-H(3) bond length is 0.93 Å. In the fifteenth C site, C(15) is bonded in a 5-coordinate geometry to one C(5), two equivalent C(1), and two equivalent C(2) atoms. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Cd(1), one C(5), and one N(2) atom. The N(1)-N(2) bond length is 1.34 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Cd(2), one N(1), and one N(2) atom. The N(2)-N(2) bond length is 1.29 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(8) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(13) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(14) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in an L-shaped geometry to one Cd(1) and one C(6) atom. In the second O site, O(2) is bonded in an L-shaped geometry to one Cd(1) and one C(6) atom. In the third O site, O(3) is bonded in a water-like geometry to one Cd(1) and one C(11) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(11) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Cd(1) and two equivalent Cd(2) atoms. Linkers: 1 [C]12[C]3C45[C]6[C]7C18[C@]21[C@@]34[C@@]65[C@@]781.[C]1=N[N]N=N1.[O]C(=O)c1c[c]cc(C([O])=O)c1 ,3 [C]12[C]3C45[C]6[C]7C18[C@]21[C@@]34[C@@]65[C@@]781.[C]1=NN=N[N]1.[O]C(=O)c1c[c]cc(C([O])=O)c1. Metal clusters: 8 [Cd]. The MOF has largest included sphere 4.95 A, density 1.57 g/cm3, surface area 2982.59 m2/g, accessible volume 0.34 cm3/g