ZnH2(C5O4)2 crystallizes in the monoclinic C2/c space group. Zn(1) is bonded in a distorted trigonal pyramidal geometry to two equivalent O(1) and two equivalent O(3) atoms. Both Zn(1)-O(1) bond lengths are 1.95 Å. Both Zn(1)-O(3) bond lengths are 1.95 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 1.40 Å. The C(1)-C(3) bond length is 1.39 Å. The C(1)-C(4) bond length is 1.51 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(5) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-C(5) bond length is 1.51 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(1), one C(2), and one H(1) atom. The C(3)-H(1) bond length is 0.93 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 1.27 Å. The C(4)-O(2) bond length is 1.22 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(3), and one O(4) atom. The C(5)-O(3) bond length is 1.26 Å. The C(5)-O(4) bond length is 1.23 Å. H(1) is bonded in a single-bond geometry to one C(3) atom. There are four 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 single-bond geometry to one C(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(5) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(5) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 4 O=[C]O[Zn](O[C]=O)(O[C]=O)O[C]=O. RCSR code: pts. The MOF has largest included sphere 5.62 A, density 1.08 g/cm3, surface area 3930.69 m2/g, accessible volume 0.55 cm3/g