MnC4N3H4O5 crystallizes in the triclinic P-1 space group. Mn(1) is bonded in an octahedral geometry to one N(1), one O(1), one O(2), one O(3), one O(4), and one O(5) atom. The Mn(1)-N(1) bond length is 2.23 Å. The Mn(1)-O(1) bond length is 2.23 Å. The Mn(1)-O(2) bond length is 2.17 Å. The Mn(1)-O(3) bond length is 2.19 Å. The Mn(1)-O(4) bond length is 2.24 Å. The Mn(1)-O(5) bond length is 2.17 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(1) atom. The C(1)-N(1) bond length is 1.32 Å. The C(1)-N(3) bond length is 1.36 Å. The C(1)-H(1) bond length is 1.08 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(2), one N(3), and one H(2) atom. The C(2)-N(2) bond length is 1.31 Å. The C(2)-N(3) bond length is 1.37 Å. The C(2)-H(2) bond length is 1.08 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(3)-O(1) bond length is 1.27 Å. The C(3)-O(2) bond length is 1.27 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(4)-O(3) bond length is 1.28 Å. The C(4)-O(4) bond length is 1.26 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Mn(1), one C(1), and one N(2) atom. The N(1)-N(2) bond length is 1.38 Å. In the second N site, N(2) is bonded in a distorted single-bond geometry to one C(2), one N(1), and one H(3) atom. The N(2)-H(3) bond length is 1.75 Å. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one C(1), one C(2), and one N(3) atom. The N(3)-N(3) bond length is 1.37 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one N(2) and one O(5) atom. The H(3)-O(5) bond length is 1.01 Å. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to one O(3) and one O(5) atom. The H(4)-O(3) bond length is 1.67 Å. The H(4)-O(5) bond length is 1.00 Å. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted water-like geometry to one Mn(1), one H(3), and one H(4) atom. In the second O site, O(1) is bonded in a water-like geometry to one Mn(1) and one C(3) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(3) atom. In the fourth O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(1), one C(4), and one H(4) atom. In the fifth O site, O(4) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(4) atom. Linkers: 1 c1nncn1-n1cnnc1 ,1 [O]C(=O)C([O])=O. Metal clusters: 2 [Mn]. The MOF has largest included sphere 2.59 A, density 1.87 g/cm3, surface area 3282.15 m2/g, accessible volume 0.08 cm3/g