CsC12H13SO9(CH)3CH3CH2CO crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of six 02329_fluka molecules, two 02329_fluka molecules, two dimethyl ether molecules, and two CsC12H13SO9 clusters. In each CsC12H13SO9 cluster, Cs(1) is bonded in a 4-coordinate geometry to one O(1), one O(10), one O(2), and one O(3) atom. The Cs(1)-O(1) bond length is 3.21 Å. The Cs(1)-O(10) bond length is 3.22 Å. The Cs(1)-O(2) bond length is 3.01 Å. The Cs(1)-O(3) bond length is 3.12 Å. There are twelve inequivalent C sites. In the first C site, C(1) is bonded in a tetrahedral geometry to one H(1), one H(2), one H(3), and one O(4) atom. The C(1)-H(1) bond length is 1.10 Å. The C(1)-H(2) bond length is 1.10 Å. The C(1)-H(3) bond length is 1.09 Å. The C(1)-O(4) bond length is 1.44 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(7) and one O(4) atom. The C(2)-C(7) bond length is 1.41 Å. The C(2)-O(4) bond length is 1.36 Å. In the third C site, C(4) is bonded in a distorted single-bond geometry to one C(5) and one H(5) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-H(5) bond length is 1.08 Å. In the fourth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(8) atom. The C(5)-C(6) bond length is 1.41 Å. The C(5)-C(8) bond length is 1.47 Å. In the fifth C site, C(6) is bonded in a distorted single-bond geometry to one C(5), one C(7), and one H(6) atom. The C(6)-C(7) bond length is 1.39 Å. The C(6)-H(6) bond length is 1.09 Å. In the sixth C site, C(7) is bonded in a trigonal planar geometry to one C(2), one C(6), and one S(1) atom. The C(7)-S(1) bond length is 1.78 Å. In the seventh C site, C(8) is bonded in a trigonal planar geometry to one C(16), one C(5), and one C(9) atom. The C(8)-C(16) bond length is 1.37 Å. The C(8)-C(9) bond length is 1.47 Å. In the eighth C site, C(9) is bonded in a distorted single-bond geometry to one C(10), one C(8), and one O(5) atom. The C(9)-C(10) bond length is 1.46 Å. The C(9)-O(5) bond length is 1.25 Å. In the ninth C site, C(10) is bonded in a trigonal planar geometry to one C(11), one C(15), and one C(9) atom. The C(10)-C(11) bond length is 1.41 Å. The C(10)-C(15) bond length is 1.40 Å. In the tenth C site, C(11) is bonded in a distorted single-bond geometry to one C(10) and one H(7) atom. The C(11)-H(7) bond length is 1.09 Å. In the eleventh C site, C(15) is bonded in a distorted single-bond geometry to one C(10) and one O(6) atom. The C(15)-O(6) bond length is 1.37 Å. In the twelfth C site, C(16) is bonded in a distorted water-like geometry to one C(8), one H(10), and one O(6) atom. The C(16)-H(10) bond length is 1.09 Å. The C(16)-O(6) bond length is 1.35 Å. There are thirteen inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(1) atom. In the fourth H site, H(5) is bonded in a single-bond geometry to one C(4) atom. In the fifth H site, H(6) is bonded in a single-bond geometry to one C(6) atom. In the sixth H site, H(7) is bonded in a single-bond geometry to one C(11) atom. In the seventh H site, H(10) is bonded in a single-bond geometry to one C(16) atom. In the eighth H site, H(16) is bonded in a single-bond geometry to one O(1) atom. The H(16)-O(1) bond length is 0.99 Å. In the ninth H site, H(17) is bonded in a single-bond geometry to one O(1) atom. The H(17)-O(1) bond length is 0.99 Å. In the tenth H site, H(18) is bonded in a single-bond geometry to one O(2) atom. The H(18)-O(2) bond length is 0.98 Å. In the eleventh H site, H(19) is bonded in a single-bond geometry to one O(2) atom. The H(19)-O(2) bond length is 0.98 Å. In the twelfth H site, H(20) is bonded in a single-bond geometry to one O(3) atom. The H(20)-O(3) bond length is 1.00 Å. In the thirteenth H site, H(21) is bonded in a single-bond geometry to one O(3) atom. The H(21)-O(3) bond length is 0.99 Å. S(1) is bonded in a distorted trigonal non-coplanar geometry to one C(7), one O(10), one O(8), and one O(9) atom. The S(1)-O(10) bond length is 1.47 Å. The S(1)-O(8) bond length is 1.48 Å. The S(1)-O(9) bond length is 1.48 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Cs(1), one H(16), and one H(17) atom. In the second O site, O(2) is bonded in a water-like geometry to one Cs(1), one H(18), and one H(19) atom. In the third O site, O(3) is bonded in a water-like geometry to one Cs(1), one H(20), and one H(21) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one C(1) and one C(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one C(9) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one C(15) and one C(16) atom. In the seventh O site, O(8) is bonded in a single-bond geometry to one S(1) atom. In the eighth O site, O(9) is bonded in a single-bond geometry to one S(1) atom. In the ninth O site, O(10) is bonded in a single-bond geometry to one Cs(1) and one S(1) atom. Linkers: 2 CCOc1ccc2c(=O)c(-c3ccc(OC)c(S([O])([O])[O])c3)coc2c1. Metal clusters: 2 [Cs]. The MOF has largest included sphere 2.03 A, density 1.86 g/cm3, surface area 4294.19 m2/g, accessible volume 0.10 cm3/g