MnC7H3O3 crystallizes in the trigonal P3_221 space group. Mn(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form distorted edge-sharing MnO5 square pyramids. The Mn(1)-O(3) bond length is 2.14 Å. There is one shorter (2.05 Å) and one longer (2.17 Å) Mn(1)-O(1) bond length. There is one shorter (2.23 Å) and one longer (2.32 Å) Mn(1)-O(2) bond length. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a single-bond geometry to one C(2) and one O(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-O(1) bond length is 1.27 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(7) atom. The C(2)-C(3) bond length is 1.38 Å. The C(2)-C(7) bond length is 1.48 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one H(3) atom. The C(3)-C(4) bond length is 1.32 Å. The C(3)-H(3) bond length is 0.95 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(4), and one C(5) atom. The C(4)-C(4) bond length is 1.60 Å. The C(4)-C(5) bond length is 1.37 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one H(1) atom. The C(5)-C(6) bond length is 1.38 Å. The C(5)-H(1) bond length is 0.95 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(5) and one H(2) atom. The C(6)-H(2) bond length is 0.95 Å. In the seventh C site, C(7) is bonded in a bent 120 degrees geometry to one C(2), one O(2), and one O(3) atom. The C(7)-O(2) bond length is 1.25 Å. The C(7)-O(3) bond length is 1.25 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(6) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Mn(1) and one C(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Mn(1) and one C(7) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one C(7) atom. Linkers: 3 [O]C(=O)[C]1C=C(C2=C[C](C([O])=O)C(=O)[CH][CH]2)[CH][CH]C1=O. Metal clusters: 6 [Mn]. The MOF has largest included sphere 15.85 A, density 0.66 g/cm3, surface area 3280.75 m2/g, accessible volume 1.13 cm3/g