InH4(C3O2)4 crystallizes in the cubic I-43d space group. In(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All In(1)-O(1) bond lengths are 2.20 Å. All In(1)-O(2) bond lengths are 2.50 Å. There are three inequivalent C sites. In the first C site, C(3) is bonded in a trigonal planar geometry to one C(2) and two equivalent C(1) atoms. The C(3)-C(2) bond length is 1.49 Å. Both C(3)-C(1) bond lengths are 1.40 Å. In the second C site, C(2) is bonded in a bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(2)-O(1) bond length is 1.29 Å. The C(2)-O(2) bond length is 1.27 Å. In the third C site, C(1) is bonded in a distorted single-bond geometry to two equivalent C(3) and one H(1) atom. The C(1)-H(1) bond length is 1.09 Å. H(1) is bonded in a single-bond geometry to one C(1) atom. There are two inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to one In(1) and one C(2) atom. In the second O site, O(1) is bonded in a water-like geometry to one In(1) and one C(2) atom. Linkers: 8 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 6 O=[C]O[In](O[C]=O)O[C]=O.[O][C]=O. RCSR code: ctn. The MOF has largest included sphere 6.35 A, density 0.88 g/cm3, surface area 3560.32 m2/g, accessible volume 0.73 cm3/g