CuC7H6O4 crystallizes in the tetragonal P4_2/mmc space group. Cu(1) is bonded in a rectangular see-saw-like geometry to four equivalent O(1) atoms. All Cu(1)-O(1) bond lengths are 1.94 Å. There are four inequivalent C sites. In the first C site, C(3) is bonded in a water-like geometry to two equivalent C(2) and two equivalent H(1,2) atoms. Both C(3)-C(2) bond lengths are 1.54 Å. Both C(3)-H(1,2) bond lengths are 0.99 Å. In the second C site, C(4) is bonded in a water-like geometry to two equivalent C(2) and two equivalent H(1,2) atoms. Both C(4)-C(2) bond lengths are 1.55 Å. Both C(4)-H(1,2) bond lengths are 0.99 Å. In the third C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2) and two equivalent O(1) atoms. The C(1)-C(2) bond length is 1.52 Å. Both C(1)-O(1) bond lengths are 1.26 Å. In the fourth C site, C(2) is bonded to one C(1), one C(4), and two equivalent C(3) atoms to form corner-sharing CC4 tetrahedra. H(1,2) is bonded in a single-bond geometry to one C(3) atom. O(1) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(1) atom. Linkers: 2 [O]C(=O)[C@]12C[C@]3(C([O])=O)C[C@](C([O])=O)(C1)C[C@](C([O])=O)(C2)C3. Metal clusters: 2 [C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4. RCSR code: pts. The MOF has largest included sphere 5.21 A, density 1.40 g/cm3, surface area 3119.94 m2/g, accessible volume 0.34 cm3/g