CuH6(C7O2)2 crystallizes in the trigonal R-3m space group. Cu(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 1.98 Å. Both Cu(1)-O(2) bond lengths are 1.94 Å. There are nine inequivalent C sites. In the first C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(7), and one H(1) atom. The C(3)-C(2) bond length is 1.39 Å. The C(3)-C(7) bond length is 1.39 Å. The C(3)-H(1) bond length is 0.93 Å. In the second C site, C(4) is bonded in a distorted single-bond geometry to one C(5), one C(8), and one H(2) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-C(8) bond length is 1.19 Å. The C(4)-H(2) bond length is 0.93 Å. In the third C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(5), and one C(9) atom. The C(5)-C(5) bond length is 1.35 Å. The C(5)-C(9) bond length is 1.37 Å. In the fourth C site, C(9) is bonded in a distorted single-bond geometry to two equivalent C(5) and one H(4) atom. The C(9)-H(4) bond length is 0.93 Å. In the fifth C site, C(6) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(3) atom. Both C(6)-C(2) bond lengths are 1.38 Å. The C(6)-H(3) bond length is 0.93 Å. In the sixth C site, C(7) is bonded in a trigonal planar geometry to one C(8) and two equivalent C(3) atoms. The C(7)-C(8) bond length is 1.58 Å. In the seventh C site, C(8) is bonded in a trigonal planar geometry to one C(7) and two equivalent C(4) atoms. In the eighth 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 1.48 Å. The C(1)-O(1) bond length is 1.24 Å. The C(1)-O(2) bond length is 1.27 Å. In the ninth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(6) atom. There are four inequivalent H sites. In the first H site, H(3) is bonded in a single-bond geometry to one C(6) atom. In the second H site, H(4) is bonded in a single-bond geometry to one C(9) atom. In the third H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(2) is bonded in a single-bond geometry to one C(4) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cu(1) and one C(1) atom. Linkers: 10 [O]C(=O)c1cc(C([O])=O)cc(C2=Cc3cc4c(cc3=C2)C=C(c2cc(C([O])=O)cc(C([O])=O)c2)C=4)c1. Metal clusters: 9 [C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4. RCSR code: nbo. The MOF has largest included sphere 12.22 A, density 0.60 g/cm3, surface area 3792.57 m2/g, accessible volume 1.22 cm3/g