In(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 2.18 Å. All In(1)-O(2) bond lengths are 2.44 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(3) and two equivalent C(2) atoms. The C(1)-C(3) bond length is 1.51 Å. There is one shorter (1.35 Å) and one longer (1.44 Å) C(1)-C(2) bond length. In the second C site, C(2) is bonded in a bent 120 degrees geometry to two equivalent C(1) atoms. In the third C site, C(3) is bonded in a bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(3)-O(1) bond length is 1.27 Å. The C(3)-O(2) bond length is 1.25 Å. 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(3) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one In(1) and one C(3) atom. Linkers: 16 [O]C(=O)c1[c]c(C([O])=O)[c]c(C([O])=O)[c]1. 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 6.24 A, density 0.90 g/cm3, surface area 3386.36 m2/g, accessible volume 0.70 cm3/g