LaC4O5CO is Indium-derived structured and crystallizes in the orthorhombic Pbcn space group. The structure is zero-dimensional and consists of eight formaldehyde molecules and four LaC4O5 clusters. In each LaC4O5 cluster, La(1) is bonded in a distorted pentagonal planar geometry to one O(1), one O(2), one O(3), one O(5), and one O(6) atom. The La(1)-O(1) bond length is 2.58 Å. The La(1)-O(2) bond length is 2.53 Å. The La(1)-O(3) bond length is 2.50 Å. The La(1)-O(5) bond length is 2.61 Å. The La(1)-O(6) bond length is 2.57 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one O(1) atom. The C(1)-O(1) bond length is 1.25 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one O(2) atom. The C(2)-O(2) bond length is 1.26 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one O(3) atom. The C(3)-O(3) bond length is 1.26 Å. In the fourth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(5)-O(5) bond length is 1.25 Å. The C(5)-O(6) bond length is 1.26 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one 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(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one La(1) and one C(3) atom. In the fourth O site, O(5) is bonded in a bent 120 degrees geometry to one La(1) and one C(5) atom. In the fifth O site, O(6) is bonded in a bent 120 degrees geometry to one La(1) and one C(5) atom. Linkers: 4 [O]C(=O)C([O])=O. Metal clusters: 8 [La]. The MOF has largest included sphere 5.27 A, density 1.72 g/cm3, surface area 2938.19 m2/g, accessible volume 0.30 cm3/g