MnC7H4O5 crystallizes in the orthorhombic Pmc2_1 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 71°. Both Mn(1)-O(1) bond lengths are 2.18 Å. Both Mn(1)-O(3) bond lengths are 2.12 Å. There is one shorter (2.22 Å) and one longer (2.23 Å) Mn(1)-O(5) bond length. In the second Mn site, Mn(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 70°. Both Mn(2)-O(2) bond lengths are 2.18 Å. Both Mn(2)-O(4) bond lengths are 2.12 Å. There is one shorter (2.21 Å) and one longer (2.23 Å) Mn(2)-O(6) bond length. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(3) and one H(3) atom. The C(1)-C(3) bond length is 1.39 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(4) and one H(4) atom. The C(2)-C(4) bond length is 1.39 Å. The C(2)-H(4) bond length is 1.09 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(1), one C(5), and one C(6) atom. The C(3)-C(5) bond length is 1.43 Å. The C(3)-C(6) bond length is 1.50 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(2), one C(5), and one C(7) atom. The C(4)-C(5) bond length is 1.43 Å. The C(4)-C(7) bond length is 1.50 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(3), one C(4), and one C(5) atom. The C(5)-C(5) bond length is 1.44 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(3) atom. The C(6)-O(1) bond length is 1.28 Å. The C(6)-O(3) bond length is 1.27 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(2), and one O(4) atom. The C(7)-O(2) bond length is 1.28 Å. The C(7)-O(4) bond length is 1.27 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(2) and one O(5) atom. The H(1)-O(2) bond length is 1.65 Å. The H(1)-O(5) bond length is 1.01 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(1) and one O(6) atom. The H(2)-O(1) bond length is 1.65 Å. The H(2)-O(6) bond length is 1.01 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. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one C(6), and one H(2) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2), one C(7), and one H(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one C(6) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Mn(2) and one C(7) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to two equivalent Mn(1) and two equivalent H(1) atoms. In the sixth O site, O(6) is bonded in a distorted water-like geometry to two equivalent Mn(2) and two equivalent H(2) atoms. Linkers: 2 [O]C(=O)c1ccc(C([O])=O)c2c(C([O])=O)ccc(C([O])=O)c12. Metal clusters: 4 [Mn]. The MOF has largest included sphere 1.96 A, density 2.09 g/cm3, surface area 2581.56 m2/g, accessible volume 0.12 cm3/g