Zn5H4(C10O9)2 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(5), one O(6), one O(8), and one O(9) atom to form edge-sharing ZnO5 square pyramids. The Zn(1)-O(1) bond length is 2.08 Å. The Zn(1)-O(5) bond length is 2.02 Å. The Zn(1)-O(6) bond length is 2.16 Å. The Zn(1)-O(8) bond length is 2.00 Å. The Zn(1)-O(9) bond length is 2.03 Å. In the second Zn site, Zn(2) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(7) atom. The Zn(2)-O(1) bond length is 1.99 Å. The Zn(2)-O(3) bond length is 2.06 Å. The Zn(2)-O(4) bond length is 2.09 Å. The Zn(2)-O(7) bond length is 2.12 Å. In the third Zn site, Zn(3) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms to form edge-sharing ZnO6 octahedra. Both Zn(3)-O(1) bond lengths are 2.07 Å. Both Zn(3)-O(2) bond lengths are 2.08 Å. Both Zn(3)-O(6) bond lengths are 2.12 Å. There are ten inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(8) atom. The C(1)-C(2) bond length is 1.51 Å. The C(1)-C(4) bond length is 1.41 Å. The C(1)-C(8) bond length is 1.39 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(6), and one O(7) atom. The C(2)-O(6) bond length is 1.25 Å. The C(2)-O(7) bond length is 1.23 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(4), and one O(9) atom. The C(3)-C(5) bond length is 1.51 Å. The C(3)-O(4) bond length is 1.24 Å. The C(3)-O(9) bond length is 1.25 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(1), one C(10), and one C(7) atom. The C(4)-C(10) bond length is 1.50 Å. The C(4)-C(7) bond length is 1.38 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(3), one C(8), and one C(9) atom. The C(5)-C(8) bond length is 1.38 Å. The C(5)-C(9) bond length is 1.40 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(9), one O(2), and one O(8) atom. The C(6)-C(9) bond length is 1.49 Å. The C(6)-O(2) bond length is 1.25 Å. The C(6)-O(8) bond length is 1.26 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(4), one C(9), and one H(1) atom. The C(7)-C(9) bond length is 1.39 Å. The C(7)-H(1) bond length is 0.93 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(2) atom. The C(8)-H(2) bond length is 0.93 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(5), one C(6), and one C(7) atom. In the tenth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(3), and one O(5) atom. The C(10)-O(3) bond length is 1.25 Å. The C(10)-O(5) bond length is 1.26 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(7) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(8) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Zn(1), one Zn(2), and one Zn(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(3) and one C(6) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Zn(2) and one C(10) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Zn(2) and one C(3) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Zn(1) and one C(10) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Zn(1), one Zn(3), and one C(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Zn(2) and one C(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one C(6) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one C(3) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 10 [Zn]. The MOF has largest included sphere 5.98 A, density 1.61 g/cm3, surface area 2704.22 m2/g, accessible volume 0.37 cm3/g