ZnH8(C5O3)2 crystallizes in the monoclinic C2/c space group. Zn(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Zn(1)-O(1) bond lengths are 2.02 Å. Both Zn(1)-O(2) bond lengths are 1.98 Å. There are five inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(3), and one C(4) atom. The C(1)-C(2) bond length is 1.42 Å. The C(1)-C(3) bond length is 1.40 Å. The C(1)-C(4) bond length is 1.49 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one O(3) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-O(3) bond length is 1.36 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(1), one C(2), and one H(1) atom. The C(3)-H(1) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(4)-O(1) bond length is 1.28 Å. The C(4)-O(2) bond length is 1.28 Å. In the fifth C site, C(5) is bonded in a tetrahedral geometry to one H(2), one H(3), one H(4), and one O(3) atom. The C(5)-H(2) bond length is 1.10 Å. The C(5)-H(3) bond length is 1.09 Å. The C(5)-H(4) bond length is 1.10 Å. The C(5)-O(3) bond length is 1.44 Å. There are four 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(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(4) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one C(2) and one C(5) atom. Linkers: 2 COc1cc(C([O])=O)c(OC)cc1C([O])=O. Metal clusters: 2 [Zn]. RCSR code: pts. The MOF has largest included sphere 2.30 A, density 1.82 g/cm3, surface area 3528.98 m2/g, accessible volume 0.14 cm3/g