CsC4H8O4ClCH2O crystallizes in the orthorhombic P2_12_12_1 space group. The structure consists of four methanol molecules inside a CsC4H8O4Cl framework. In the CsC4H8O4Cl framework, Cs(1) is bonded in a 12-coordinate geometry to one H(1), one H(3), one H(6), one H(9), one O(2), one O(4), one O(5), two equivalent O(1), and three equivalent Cl(1) atoms. The Cs(1)-H(1) bond length is 3.36 Å. The Cs(1)-H(3) bond length is 3.15 Å. The Cs(1)-H(6) bond length is 3.15 Å. The Cs(1)-H(9) bond length is 3.39 Å. The Cs(1)-O(2) bond length is 3.32 Å. The Cs(1)-O(4) bond length is 3.22 Å. The Cs(1)-O(5) bond length is 3.22 Å. There is one shorter (3.22 Å) and one longer (3.34 Å) Cs(1)-O(1) bond length. There are a spread of Cs(1)-Cl(1) bond distances ranging from 3.41-3.52 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal non-coplanar geometry to one H(5), one O(1), and one O(2) atom. The C(1)-H(5) bond length is 1.11 Å. The C(1)-O(1) bond length is 1.45 Å. The C(1)-O(2) bond length is 1.39 Å. In the second C site, C(5) is bonded in a distorted water-like geometry to one H(10) and one O(4) atom. The C(5)-H(10) bond length is 1.10 Å. The C(5)-O(4) bond length is 1.44 Å. In the third C site, C(2) is bonded in a distorted trigonal non-coplanar geometry to one H(6), one H(7), and one O(1) atom. The C(2)-H(6) bond length is 1.10 Å. The C(2)-H(7) bond length is 1.10 Å. The C(2)-O(1) bond length is 1.44 Å. In the fourth C site, C(4) is bonded in a distorted water-like geometry to one H(9) and one O(5) atom. The C(4)-H(9) bond length is 1.10 Å. The C(4)-O(5) bond length is 1.42 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Cs(1), one O(2), and one Cl(1) atom. The H(1)-O(2) bond length is 1.00 Å. The H(1)-Cl(1) bond length is 2.02 Å. In the second H site, H(9) is bonded in a single-bond geometry to one Cs(1) and one C(4) atom. In the third H site, H(10) is bonded in a single-bond geometry to one C(5) atom. In the fourth H site, H(3) is bonded in a single-bond geometry to one Cs(1), one O(4), and one Cl(1) atom. The H(3)-O(4) bond length is 1.00 Å. The H(3)-Cl(1) bond length is 2.01 Å. In the fifth H site, H(4) is bonded in a single-bond geometry to one O(5) atom. The H(4)-O(5) bond length is 0.99 Å. In the sixth H site, H(5) is bonded in a single-bond geometry to one C(1) atom. In the seventh H site, H(6) is bonded in a single-bond geometry to one Cs(1) and one C(2) atom. In the eighth H site, H(7) is bonded in a single-bond geometry to one C(2) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Cs(1), one C(1), and one C(2) atom. In the second O site, O(2) is bonded in a water-like geometry to one Cs(1), one C(1), and one H(1) atom. In the third O site, O(4) is bonded in a distorted water-like geometry to one Cs(1), one C(5), and one H(3) atom. In the fourth O site, O(5) is bonded in a water-like geometry to one Cs(1), one C(4), and one H(4) atom. Cl(1) is bonded in a 2-coordinate geometry to three equivalent Cs(1), one H(1), and one H(3) atom. Linkers: 4 O[C@@H]1[C@H](O)[C@H](O)CO[C@H]1O. Metal clusters: 4 [Cs]. The MOF has largest included sphere 1.74 A, density 2.35 g/cm3, surface area 3222.48 m2/g, accessible volume 0.07 cm3/g