LaC4H3O9(CH)4 crystallizes in the triclinic P-1 space group. The structure consists of eight 02329_fluka molecules inside a LaC4H3O9 framework. In the LaC4H3O9 framework, La(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(7) atoms. The La(1)-O(2) bond length is 2.49 Å. The La(1)-O(3) bond length is 2.41 Å. The La(1)-O(4) bond length is 2.56 Å. The La(1)-O(5) bond length is 2.50 Å. The La(1)-O(6) bond length is 2.53 Å. There is one shorter (2.61 Å) and one longer (2.73 Å) La(1)-O(1) bond length. There is one shorter (2.50 Å) and one longer (2.86 Å) La(1)-O(7) bond length. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(7) atom. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(7) bond length is 1.27 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(8) atom. The C(2)-O(3) bond length is 1.27 Å. The C(2)-O(8) bond length is 1.27 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(4) atom. The C(3)-O(2) bond length is 1.29 Å. The C(3)-O(4) bond length is 1.26 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(9) atom. The C(4)-O(6) bond length is 1.25 Å. The C(4)-O(9) bond length is 1.31 Å. There are three inequivalent H sites. In the first H site, H(5) is bonded in a single-bond geometry to one O(5) atom. The H(5)-O(5) bond length is 0.99 Å. In the second H site, H(6) is bonded in a single-bond geometry to one O(5) and one O(8) atom. The H(6)-O(5) bond length is 0.99 Å. The H(6)-O(8) bond length is 1.71 Å. In the third H site, H(7) is bonded in a linear geometry to one O(8) and one O(9) atom. The H(7)-O(8) bond length is 1.45 Å. The H(7)-O(9) bond length is 1.06 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent La(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one La(1) and one C(3) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one La(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one La(1) and one C(3) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one La(1), one H(5), and one H(6) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one La(1) and one C(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent La(1) and one C(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one C(2), one H(6), and one H(7) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one C(4) and one H(7) atom. Linkers: 2 [O]C(=O)[C@@H]1[C@@H](C([O])=O)[C@H](C(=O)O)[C@H]1C([O])=O. Metal clusters: 2 [La]. The MOF has largest included sphere 2.28 A, density 2.56 g/cm3, surface area 2455.46 m2/g, accessible volume 0.07 cm3/g