CuC6N4H4O3 crystallizes in the orthorhombic Pnma space group. Cu(1) is bonded to two equivalent N(2), two equivalent O(1), and two equivalent O(2) atoms to form edge-sharing CuN2O4 octahedra. Both Cu(1)-N(2) bond lengths are 2.04 Å. Both Cu(1)-O(1) bond lengths are 1.96 Å. Both Cu(1)-O(2) bond lengths are 2.48 Å. There are four inequivalent C sites. In the first C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one H(2) atom. The C(3)-C(2) bond length is 1.38 Å. The C(3)-N(1) bond length is 1.37 Å. The C(3)-H(2) bond length is 1.09 Å. In the second C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(1) and two equivalent O(1) atoms. The C(4)-C(1) bond length is 1.49 Å. Both C(4)-O(1) bond lengths are 1.27 Å. In the third C site, C(1) is bonded in a trigonal planar geometry to one C(4) and two equivalent C(2) atoms. Both C(1)-C(2) bond lengths are 1.40 Å. In the fourth C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one H(1) atom. The C(2)-H(1) bond length is 1.09 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to two equivalent C(3) and one O(2) atom. The N(1)-O(2) bond length is 1.30 Å. In the second N site, N(2) is bonded in a trigonal non-coplanar geometry to two equivalent Cu(1) and one N(3) atom. The N(2)-N(3) bond length is 1.22 Å. In the third N site, N(3) is bonded in a linear geometry to one N(2) and one N(4) atom. The N(3)-N(4) bond length is 1.16 Å. In the fourth N site, N(4) is bonded in a single-bond geometry to one N(3) atom. 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) is bonded in a single-bond geometry to one C(3) atom. There are two inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Cu(1) and one N(1) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(4) atom. Linkers: 4 [O]C(=O)c1cc[n+]([O-])cc1 ,4 [N][N][N]. Metal clusters: 4 [Cu]. The MOF has largest included sphere 2.91 A, density 1.86 g/cm3, surface area 3495.42 m2/g, accessible volume 0.13 cm3/g