CuC21H13O5 crystallizes in the trigonal R-3m space group. Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 1.96 Å. Both Cu(1)-O(2) bond lengths are 1.96 Å. There are twelve inequivalent C sites. In the first C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(8) atom. The C(5)-C(4) bond length is 1.38 Å. The C(5)-C(6) bond length is 1.40 Å. The C(5)-C(8) bond length is 1.49 Å. In the second C site, C(6) is bonded in a distorted single-bond geometry to one C(5), one C(7), and one H(3) atom. The C(6)-C(7) bond length is 1.39 Å. The C(6)-H(3) bond length is 0.94 Å. In the third C site, C(7) is bonded in a distorted trigonal planar geometry to one C(2), one C(6), and one H(4) atom. The C(7)-C(2) bond length is 1.36 Å. The C(7)-H(4) bond length is 0.94 Å. In the fourth C site, C(8) is bonded in a trigonal planar geometry to one C(11), one C(5), and one C(9) atom. The C(8)-C(11) bond length is 1.40 Å. The C(8)-C(9) bond length is 1.38 Å. In the fifth C site, C(9) is bonded in a distorted single-bond geometry to one C(10), one C(8), and one H(5) atom. The C(9)-C(10) bond length is 1.40 Å. The C(9)-H(5) bond length is 0.94 Å. In the sixth C site, C(10) is bonded in a trigonal planar geometry to one C(10) and two equivalent C(9) atoms. The C(10)-C(10) bond length is 1.46 Å. In the seventh C site, C(11) is bonded in a single-bond geometry to two equivalent C(8) and one O(3) atom. The C(11)-O(3) bond length is 1.37 Å. In the eighth C site, C(12) is bonded in a tetrahedral geometry to one H(7), two equivalent H(6), and one O(3) atom. The C(12)-H(7) bond length is 0.97 Å. Both C(12)-H(6) bond lengths are 0.97 Å. The C(12)-O(3) bond length is 1.39 Å. In the ninth 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 1.51 Å. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.25 Å. In the tenth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(7) atom. The C(2)-C(3) bond length is 1.40 Å. In the eleventh C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-H(1) bond length is 0.94 Å. In the twelfth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one H(2) atom. The C(4)-H(2) bond length is 0.94 Å. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) 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(7) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(9) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(12) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(12) atom. There are three inequivalent O sites. In the first O site, O(3) is bonded in a water-like geometry to one C(11) and one C(12) atom. In the second O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(1) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(1) atom. Linkers: 9 COc1c(-c2ccc(C([O])=O)cc2)cc(-c2cc(-c3ccc(C([O])=O)cc3)c(OC)c(-c3ccc(C([O])=O)cc3)c2)cc1-c1ccc(C([O])=O)cc1. 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 11.43 A, density 0.52 g/cm3, surface area 4527.80 m2/g, accessible volume 1.54 cm3/g