MnC5N2H4O5 crystallizes in the orthorhombic Pbca 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 2.21 Å. The Mn(1)-O(1) bond length is 2.17 Å. The Mn(1)-O(2) bond length is 2.13 Å. The Mn(1)-O(3) bond length is 2.14 Å. The Mn(1)-O(4) bond length is 2.31 Å. The Mn(1)-O(5) bond length is 2.19 Å. There are five inequivalent C sites. In the first C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one N(1) atom. The C(4)-C(3) bond length is 1.40 Å. The C(4)-C(5) bond length is 1.48 Å. The C(4)-N(1) bond length is 1.38 Å. In the second C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(4) atom. The C(1)-N(1) bond length is 1.33 Å. The C(1)-N(2) bond length is 1.35 Å. The C(1)-H(4) bond length is 1.08 Å. In the third C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(4), and one O(5) atom. The C(5)-O(4) bond length is 1.29 Å. The C(5)-O(5) bond length is 1.27 Å. In the fourth C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(3) atom. The C(2)-C(3) bond length is 1.48 Å. The C(2)-O(1) bond length is 1.29 Å. The C(2)-O(3) bond length is 1.27 Å. In the fifth C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one N(2) atom. The C(3)-N(2) bond length is 1.38 Å. There are two 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 C(4) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one H(3) atom. The N(2)-H(3) bond length is 1.05 Å. There are four inequivalent H sites. In the first H site, H(4) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(1) is bonded in a single-bond geometry to one O(1) and one O(2) atom. The H(1)-O(1) bond length is 1.73 Å. The H(1)-O(2) bond length is 0.99 Å. In the third H site, H(2) is bonded in a single-bond geometry to one O(2) atom. The H(2)-O(2) bond length is 0.99 Å. In the fourth H site, H(3) is bonded in a single-bond geometry to one N(2) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mn(1), one C(2), and one H(1) atom. In the second O site, O(5) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(5) atom. In the third O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(1), one H(1), and one H(2) atom. In the fourth O site, O(3) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(2) atom. In the fifth O site, O(4) is bonded in a distorted single-bond geometry to one Mn(1) and one C(5) atom. Linkers: 8 [O]C(=O)c1nc[nH]c1C([O])=O. Metal clusters: 8 [Mn]. The MOF has largest included sphere 1.69 A, density 2.21 g/cm3, surface area 2749.53 m2/g, accessible volume 0.10 cm3/g