Ca2C5H(SO4)2CH crystallizes in the orthorhombic Pbcn space group. The structure consists of eight 02329_fluka molecules inside a Ca2C5H(SO4)2 framework. In the Ca2C5H(SO4)2 framework, there are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(6), one O(8), and two equivalent O(7) atoms. The Ca(1)-O(1) bond length is 2.53 Å. The Ca(1)-O(2) bond length is 2.42 Å. The Ca(1)-O(6) bond length is 2.41 Å. The Ca(1)-O(8) bond length is 2.39 Å. There is one shorter (2.37 Å) and one longer (2.47 Å) Ca(1)-O(7) bond length. In the second Ca site, Ca(2) is bonded in a distorted trigonal planar geometry to one O(1), one O(4), and one O(8) atom. The Ca(2)-O(1) bond length is 2.42 Å. The Ca(2)-O(4) bond length is 2.45 Å. The Ca(2)-O(8) bond length is 2.37 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(6), and one S(1) atom. The C(1)-C(2) bond length is 1.38 Å. The C(1)-C(6) bond length is 1.43 Å. The C(1)-S(1) bond length is 1.74 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 H(1) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-H(1) bond length is 0.93 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one S(2) atom. The C(3)-C(4) bond length is 1.43 Å. The C(3)-S(2) bond length is 1.74 Å. In the fourth C site, C(4) is bonded in a single-bond geometry to one C(3) and one O(8) atom. The C(4)-O(8) bond length is 1.31 Å. In the fifth C site, C(6) is bonded in a single-bond geometry to one C(1) and one O(7) atom. The C(6)-O(7) bond length is 1.33 Å. H(1) is bonded in a single-bond geometry to one C(2) atom. There are two inequivalent S sites. In the first S site, S(1) is bonded in a distorted trigonal non-coplanar geometry to one C(1), one O(1), one O(2), and one O(3) atom. The S(1)-O(1) bond length is 1.48 Å. The S(1)-O(2) bond length is 1.46 Å. The S(1)-O(3) bond length is 1.45 Å. In the second S site, S(2) is bonded in a distorted trigonal non-coplanar geometry to one C(3), one O(4), one O(5), and one O(6) atom. The S(2)-O(4) bond length is 1.46 Å. The S(2)-O(5) bond length is 1.46 Å. The S(2)-O(6) bond length is 1.46 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ca(1), one Ca(2), and one S(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ca(1) and one S(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one S(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Ca(2) and one S(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one S(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ca(1) and one S(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one C(6) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ca(2), and one C(4) atom. Linkers: 8 [O]c1cc([O])c(S([O])([O])[O])cc1S([O])([O])[O]. Metal clusters: 16 [Ca]. The MOF has largest included sphere 5.11 A, density 1.22 g/cm3, surface area 3495.50 m2/g, accessible volume 0.35 cm3/g