MnC5N5H3O2 crystallizes in the orthorhombic P2_12_12_1 space group. Mn(1) is bonded in an octahedral geometry to one N(1), one N(2), one N(4), one N(5), one O(1), and one O(2) atom. The Mn(1)-N(1) bond length is 2.36 Å. The Mn(1)-N(2) bond length is 2.13 Å. The Mn(1)-N(4) bond length is 2.31 Å. The Mn(1)-N(5) bond length is 2.15 Å. The Mn(1)-O(1) bond length is 2.18 Å. The Mn(1)-O(2) bond length is 2.11 Å. There are five inequivalent C sites. In the first C site, C(5) is bonded in a distorted trigonal planar geometry to one C(3), one N(4), and one H(3) atom. The C(5)-C(3) bond length is 1.39 Å. The C(5)-N(4) bond length is 1.34 Å. The C(5)-H(3) bond length is 1.09 Å. In the second C site, C(1) is bonded in a distorted single-bond geometry to one N(1) atom. The C(1)-N(1) bond length is 1.35 Å. In the third C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(2)-O(1) bond length is 1.27 Å. The C(2)-O(2) bond length is 1.27 Å. In the fourth C site, C(3) is bonded in a distorted trigonal planar geometry to one C(5), one N(1), and one H(1) atom. The C(3)-N(1) bond length is 1.34 Å. The C(3)-H(1) bond length is 1.09 Å. In the fifth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one N(4) and one H(2) atom. The C(4)-N(4) bond length is 1.34 Å. The C(4)-H(2) bond length is 1.09 Å. There are five 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(3) atom. In the second N site, N(2) is bonded in a bent 120 degrees geometry to one Mn(1) and one N(3) atom. The N(2)-N(3) bond length is 1.19 Å. In the third N site, N(3) is bonded in a linear geometry to one N(2) and one N(5) atom. The N(3)-N(5) bond length is 1.18 Å. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Mn(1), one C(4), and one C(5) atom. In the fifth N site, N(5) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one N(3) atom. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. There are two inequivalent O sites. In the first O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one C(2) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(2) atom. Linkers: 4 [O]C(=O)c1cnccn1. Metal clusters: 4 [Mn]. The MOF has largest included sphere 3.19 A, density 1.72 g/cm3, surface area 3415.35 m2/g, accessible volume 0.16 cm3/g