MnC4NH2O5 crystallizes in the triclinic P-1 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in an octahedral geometry to two equivalent N(1), two equivalent O(2), and two equivalent O(3) atoms. Both Mn(1)-N(1) bond lengths are 2.29 Å. Both Mn(1)-O(2) bond lengths are 2.08 Å. Both Mn(1)-O(3) bond lengths are 2.28 Å. In the second Mn site, Mn(2) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms. Both Mn(2)-O(1) bond lengths are 2.09 Å. Both Mn(2)-O(4) bond lengths are 2.31 Å. Both Mn(2)-O(5) bond lengths are 2.14 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(3), one C(4), and one N(1) atom. The C(1)-C(3) bond length is 1.40 Å. The C(1)-C(4) bond length is 1.51 Å. The C(1)-N(1) bond length is 1.34 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(2)-C(3) bond length is 1.50 Å. The C(2)-O(1) bond length is 1.27 Å. The C(2)-O(2) bond length is 1.27 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(1), one C(2), and one N(1) atom. The C(3)-N(1) bond length is 1.35 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(3), and one O(4) atom. The C(4)-O(3) bond length is 1.27 Å. The C(4)-O(4) bond length is 1.27 Å. N(1) is bonded in a distorted trigonal planar geometry to one Mn(1), one C(1), and one C(3) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) atom. The H(2)-O(5) bond length is 0.99 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Mn(2) and one C(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Mn(1) and one C(4) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Mn(2) and one C(4) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Mn(2), one H(1), and one H(2) atom. Linkers: 1 [O]C(=O)c1nc(C([O])=O)c(C([O])=O)nc1C([O])=O. Metal clusters: 2 [Mn]. The MOF has largest included sphere 1.62 A, density 2.57 g/cm3, surface area 1949.31 m2/g, accessible volume 0.03 cm3/g