CuC8NH3O4 crystallizes in the trigonal R-3 space group. Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Cu(1)-O(1) bond length is 1.90 Å. The Cu(1)-O(2) bond length is 1.95 Å. The Cu(1)-O(3) bond length is 1.93 Å. The Cu(1)-O(4) bond length is 1.96 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(3), one C(4), and one C(5) atom. The C(1)-C(3) bond length is 1.48 Å. The C(1)-C(4) bond length is 1.34 Å. The C(1)-C(5) bond length is 1.43 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(3), one C(6), and one C(8) atom. The C(2)-C(3) bond length is 1.43 Å. The C(2)-C(6) bond length is 1.39 Å. The C(2)-C(8) bond length is 1.54 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(1), one C(2), and one H(1) atom. The C(3)-H(1) bond length is 0.94 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(1), one C(7), and one H(2) atom. The C(4)-C(7) bond length is 1.36 Å. The C(4)-H(2) bond length is 0.94 Å. In the fifth C site, C(5) is bonded in a bent 120 degrees geometry to one C(1), one O(1), and one O(4) atom. The C(5)-O(1) bond length is 1.26 Å. The C(5)-O(4) bond length is 1.36 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(2), one C(7), and one H(3) atom. The C(6)-C(7) bond length is 1.41 Å. The C(6)-H(3) bond length is 0.94 Å. In the seventh C site, C(7) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one N(1) atom. The C(7)-N(1) bond length is 1.36 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(2), and one O(3) atom. The C(8)-O(2) bond length is 1.28 Å. The C(8)-O(3) bond length is 1.27 Å. N(1) is bonded in a distorted linear geometry to one C(7) and one N(1) atom. The N(1)-N(1) bond length is 0.90 Å. There are three 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. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cu(1) and one C(5) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cu(1) and one C(8) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(8) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(5) atom. Linkers: 5 [O]C(=O)c1cc([N][N]c2cc(C([O])=O)cc(C([O])=O)c2)cc(C([O])=O)c1. Metal clusters: 3 [C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4. RCSR code: nbo. The MOF has largest included sphere 10.91 A, density 0.77 g/cm3, surface area 3372.55 m2/g, accessible volume 1.02 cm3/g