MnP2H10(C4O3)2 crystallizes in the monoclinic C2/c space group. Mn(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Mn(1)-O(1) bond lengths are 2.18 Å. Both Mn(1)-O(2) bond lengths are 2.14 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal non-coplanar geometry to one C(2) and three equivalent H(2,3,4) atoms. The C(1)-C(2) bond length is 1.51 Å. All C(1)-H(2,3,4) bond lengths are 0.96 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(4) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(4) bond length is 1.39 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one P(1) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-P(1) bond length is 1.80 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(2), one C(3), and one H(5) atom. The C(4)-H(5) bond length is 0.93 Å. P(1) is bonded in a distorted tetrahedral geometry to one C(3), one O(1), one O(2), and one O(3) atom. The P(1)-O(1) bond length is 1.51 Å. The P(1)-O(2) bond length is 1.50 Å. The P(1)-O(3) bond length is 1.58 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 0.82 Å. In the second H site, H(2,3,4) is bonded in a single-bond geometry to one C(1) atom. In the third H site, H(5) is bonded in a single-bond geometry to one C(4) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the third O site, O(3) is bonded in a water-like geometry to one P(1) and one H(1) atom. Linkers: 4 Cc1cc(P([O])(=O)O)c(C)cc1P([O])(=O)O. Metal clusters: 4 [Mn]. The MOF has largest included sphere 3.80 A, density 1.45 g/cm3, surface area 3988.47 m2/g, accessible volume 0.26 cm3/g