InC2H3O5 crystallizes in the tetragonal I-42d space group. In(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing InO6 octahedra. The corner-sharing octahedral tilt angles are 36°. Both In(1)-O(1) bond lengths are 2.13 Å. Both In(1)-O(2) bond lengths are 2.23 Å. Both In(1)-O(3) bond lengths are 2.22 Å. C(1) is bonded in a trigonal planar geometry to one H(1), one O(2), and one O(3) atom. The C(1)-H(1) bond length is 1.11 Å. The C(1)-O(2) bond length is 1.27 Å. The C(1)-O(3) bond length is 1.27 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. The H(2)-O(1) bond length is 0.98 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent In(1) and one H(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one In(1) and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one In(1) and one C(1) atom. Linkers: 8 [O]C=O ,4 [OH]. Metal clusters: 4 [In]. The MOF has largest included sphere 1.48 A, density 3.05 g/cm3, surface area 2219.55 m2/g, accessible volume 0.03 cm3/g