InC8NH6O5 crystallizes in the trigonal R-3 space group. In(1) is bonded to one N(1), one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form distorted corner-sharing InNO5 octahedra. The corner-sharing octahedral tilt angles are 56°. The In(1)-N(1) bond length is 2.29 Å. The In(1)-O(1) bond length is 2.17 Å. The In(1)-O(2) bond length is 2.16 Å. The In(1)-O(3) bond length is 2.18 Å. There is one shorter (2.10 Å) and one longer (2.11 Å) In(1)-O(5) bond length. There are eight inequivalent C sites. In the first C site, C(3) is bonded in a single-bond geometry to one C(2), one C(4), and one H(4) atom. The C(3)-C(2) bond length is 1.38 Å. The C(3)-C(4) bond length is 1.38 Å. The C(3)-H(4) bond length is 0.93 Å. In the second C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(6) atom. The C(4)-C(5) bond length is 1.50 Å. The C(4)-C(6) bond length is 1.41 Å. In the third C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(3), and one O(4) atom. The C(5)-O(3) bond length is 1.27 Å. The C(5)-O(4) bond length is 1.23 Å. In the fourth C site, C(6) is bonded in a distorted single-bond geometry to one C(4) and one H(5) atom. The C(6)-H(5) bond length is 0.93 Å. In the fifth C site, C(7) is bonded in a distorted single-bond geometry to one N(1) atom. The C(7)-N(1) bond length is 1.46 Å. In the sixth C site, C(8) is bonded in a distorted single-bond geometry to one C(2) and one H(6) atom. The C(8)-C(2) bond length is 1.40 Å. The C(8)-H(6) bond length is 0.93 Å. In the seventh C site, C(1) is bonded in a distorted 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 1.26 Å. The C(1)-O(2) bond length is 1.28 Å. In the eighth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(8) atom. N(1) is bonded in a distorted bent 120 degrees geometry to one In(1), one C(7), one H(1), and one H(2) atom. The N(1)-H(1) bond length is 0.88 Å. The N(1)-H(2) bond length is 0.87 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(5) atom. The H(3)-O(5) bond length is 0.88 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(3) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(6) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(8) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one In(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees 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(5) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(5) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent In(1) and one H(3) atom. Linkers: 6 Nc1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 6 [In]. The MOF has largest included sphere 10.30 A, density 1.53 g/cm3, surface area 2759.95 m2/g, accessible volume 0.28 cm3/g