Cu2C9H3O7 crystallizes in the monoclinic Pc space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(4) atoms to form distorted corner-sharing CuO5 square pyramids. The Cu(1)-O(1) bond length is 2.00 Å. The Cu(1)-O(2) bond length is 2.04 Å. The Cu(1)-O(3) bond length is 1.93 Å. There is one shorter (1.90 Å) and one longer (2.35 Å) Cu(1)-O(4) bond length. In the second Cu site, Cu(2) is bonded in a distorted T-shaped geometry to one O(4), one O(5), and one O(6) atom. The Cu(2)-O(4) bond length is 1.91 Å. The Cu(2)-O(5) bond length is 1.98 Å. The Cu(2)-O(6) bond length is 1.95 Å. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(7) atom. The C(1)-C(2) bond length is 1.38 Å. The C(1)-C(6) bond length is 1.40 Å. The C(1)-C(7) bond length is 1.49 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(1) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-H(1) bond length is 0.93 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(8) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-C(8) bond length is 1.51 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3); one C(5); and one H(2,3) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-H(2,3) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(9) atom. The C(5)-C(6) bond length is 1.41 Å. The C(5)-C(9) bond length is 1.50 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1); one C(5); and one H(2,3) atom. The C(6)-H(2,3) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.27 Å. The C(7)-O(2) bond length is 1.27 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(5) atom. The C(8)-O(3) bond length is 1.28 Å. The C(8)-O(5) bond length is 1.25 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(6), and one O(7) atom. The C(9)-O(6) bond length is 1.29 Å. The C(9)-O(7) bond length is 1.23 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2,3) is bonded in a single-bond geometry to one C(4) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in an L-shaped geometry to one Cu(1) and one C(7) atom. In the second O site, O(2) is bonded in an L-shaped geometry to one Cu(1) and one C(7) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(8) atom. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Cu(2) and two equivalent Cu(1) atoms. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Cu(2) and one C(8) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one C(9) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one C(9) atom. Linkers: 2 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 4 [Cu]. The MOF has largest included sphere 4.61 A, density 1.98 g/cm3, surface area 2777.78 m2/g, accessible volume 0.14 cm3/g