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 2.16 Å. All In(1)-O(2) bond lengths are 2.42 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.24 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1) and two equivalent C(3) atoms. There is one shorter (1.39 Å) and one longer (1.40 Å) C(2)-C(3) bond length. In the third C site, C(3) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(1) atom. The C(3)-H(1) bond length is 0.93 Å. H(1) is bonded in a single-bond geometry to one C(3) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in an L-shaped geometry to one In(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one In(1) and one C(1) atom. Linkers: 16 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 12 O=[C]O[In](O[C]=O)O[C]=O.[O][C]=O. RCSR code: ctn. The MOF has largest included sphere 6.25 A, density 0.92 g/cm3, surface area 3421.14 m2/g, accessible volume 0.76 cm3/g