BaC3H2O5CH2 crystallizes in the monoclinic P2_1/c space group. The structure consists of four 02329_fluka molecules inside a BaC3H2O5 framework. In the BaC3H2O5 framework, Ba(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. The Ba(1)-O(3) bond length is 2.86 Å. There is one shorter (2.71 Å) and one longer (2.82 Å) Ba(1)-O(1) bond length. There is one shorter (2.77 Å) and one longer (2.95 Å) Ba(1)-O(2) bond length. There is one shorter (2.73 Å) and one longer (2.93 Å) Ba(1)-O(4) bond length. There is one shorter (2.90 Å) and one longer (2.94 Å) Ba(1)-O(5) bond length. There are three inequivalent C sites. In the first C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(5) atom. The C(4)-O(4) bond length is 1.27 Å. The C(4)-O(5) bond length is 1.28 Å. In the second C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.27 Å. In the third C site, C(3) is bonded in a distorted water-like geometry to one H(4) and one O(3) atom. The C(3)-H(4) bond length is 1.10 Å. The C(3)-O(3) bond length is 1.43 Å. There are two inequivalent H sites. In the first H site, H(3) is bonded in a single-bond geometry to one O(3) atom. The H(3)-O(3) bond length is 0.98 Å. In the second H site, H(4) is bonded in a single-bond geometry to one C(3) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Ba(1), one C(3), and one H(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one C(4) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to two equivalent Ba(1) and one C(4) atom. Linkers: 2 [O]C(=O)C[C@@H](O)C([O])=O ,2 [O]C(=O)C[C@H](O)C([O])=O. Metal clusters: 4 [Ba]. The MOF has largest included sphere 1.44 A, density 3.01 g/cm3, surface area 2023.63 m2/g, accessible volume 0.03 cm3/g