CdC6PNH4O5 crystallizes in the monoclinic P2_1/c space group. Cd(1) is bonded to one N(1), one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted CdNO5 octahedra that share corners with four equivalent P(1)CO3 tetrahedra and  an edgeedge with one Cd(1)NO5 octahedra. The Cd(1)-N(1) bond length is 2.30 Å. The Cd(1)-O(2) bond length is 2.43 Å. The Cd(1)-O(3) bond length is 2.22 Å. The Cd(1)-O(4) bond length is 2.35 Å. There is one shorter (2.32 Å) and one longer (2.37 Å) Cd(1)-O(1) bond length. There are six inequivalent C sites. In the first C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(6) atom. The C(3)-C(2) bond length is 1.40 Å. The C(3)-C(4) bond length is 1.40 Å. The C(3)-C(6) bond length is 1.50 Å. In the second C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(2) atom. The C(4)-C(5) bond length is 1.38 Å. The C(4)-H(2) bond length is 1.09 Å. In the third C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one N(1), and one H(3) atom. The C(5)-N(1) bond length is 1.34 Å. The C(5)-H(3) bond length is 1.09 Å. In the fourth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(4), and one O(5) atom. The C(6)-O(4) bond length is 1.25 Å. The C(6)-O(5) bond length is 1.31 Å. In the fifth C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one P(1), and one N(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-P(1) bond length is 1.84 Å. The C(1)-N(1) bond length is 1.35 Å. In the sixth C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(1) atom. The C(2)-H(1) bond length is 1.09 Å. P(1) is bonded to one C(1), one O(1), one O(2), and one O(3) atom to form distorted PCO3 tetrahedra that share corners with four equivalent Cd(1)NO5 octahedra. The corner-sharing octahedral tilt angles range from 47-64°. The P(1)-O(1) bond length is 1.55 Å. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(3) bond length is 1.52 Å. N(1) is bonded in a trigonal planar geometry to one Cd(1), one C(1), and one C(5) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) 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(5) atom. In the fourth H site, H(4) is bonded in a linear geometry to one O(2) and one O(5) atom. The H(4)-O(2) bond length is 1.42 Å. The H(4)-O(5) bond length is 1.07 Å. 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(6) atom. In the second O site, O(5) is bonded in a water-like geometry to one C(6) and one H(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cd(1) and one P(1) atom. In the fourth O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Cd(1) and one P(1) atom. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to one Cd(1), one P(1), and one H(4) atom. Linkers: 4 [O]P([O])(=O)c1cc(C(=O)O)ccn1. Metal clusters: 4 [Cd]. The MOF has largest included sphere 1.84 A, density 2.60 g/cm3, surface area 2717.57 m2/g, accessible volume 0.08 cm3/g