InH4(C3O2)4 crystallizes in the trigonal R3c space group. In(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The In(1)-O(1) bond length is 2.53 Å. The In(1)-O(2) bond length is 2.16 Å. The In(1)-O(3) bond length is 2.15 Å. The In(1)-O(4) bond length is 2.49 Å. The In(1)-O(5) bond length is 2.39 Å. The In(1)-O(6) bond length is 2.20 Å. The In(1)-O(7) bond length is 2.38 Å. The In(1)-O(8) bond length is 2.19 Å. There are twelve inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(7) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.31 Å. The C(1)-C(7) bond length is 1.55 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(1) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-H(1) bond length is 0.93 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(8) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-C(8) bond length is 1.48 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(2) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(2) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(9) atom. The C(5)-C(6) bond length is 1.43 Å. The C(5)-C(9) bond length is 1.48 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(3) atom. The C(6)-H(3) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.22 Å. The C(7)-O(2) bond length is 1.25 Å. In the eighth C site, C(8) is bonded in a bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.29 Å. The C(8)-O(4) bond length is 1.28 Å. In the ninth C site, C(9) is bonded in a bent 120 degrees geometry to one C(5), one O(5), and one O(6) atom. The C(9)-O(5) bond length is 1.26 Å. The C(9)-O(6) bond length is 1.28 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to two equivalent C(11) and one H(4) atom. There is one shorter (1.39 Å) and one longer (1.42 Å) C(10)-C(11) bond length. The C(10)-H(4) bond length is 0.93 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(12) and two equivalent C(10) atoms. The C(11)-C(12) bond length is 1.50 Å. In the twelfth C site, C(12) is bonded in a bent 120 degrees geometry to one C(11), one O(7), and one O(8) atom. The C(12)-O(7) bond length is 1.25 Å. The C(12)-O(8) bond length is 1.27 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(10) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one In(1) and one C(7) atom. In the second O site, O(2) is bonded in a water-like geometry to one In(1) and one C(7) atom. In the third O site, O(3) is bonded in a water-like geometry to one In(1) and one C(8) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one In(1) and one C(8) atom. In the fifth O site, O(5) is bonded in a distorted L-shaped geometry to one In(1) and one C(9) atom. In the sixth O site, O(6) is bonded in an L-shaped geometry to one In(1) and one C(9) atom. In the seventh O site, O(7) is bonded in a distorted L-shaped geometry to one In(1) and one C(12) atom. In the eighth O site, O(8) is bonded in an L-shaped geometry to one In(1) and one C(12) atom. Linkers: 24 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 18 O=[C]O[In](O[C]=O)O[C]=O.[O][C]=O. RCSR code: ctn. The MOF has largest included sphere 6.84 A, density 0.91 g/cm3, surface area 3399.03 m2/g, accessible volume 0.75 cm3/g