Na2C6NH7O6 crystallizes in the cubic P2_13 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one H(1), three equivalent O(1), and three equivalent O(2) atoms. The Na(1)-H(1) bond length is 2.27 Å. All Na(1)-O(1) bond lengths are 2.41 Å. All Na(1)-O(2) bond lengths are 2.33 Å. In the second Na site, Na(2) is bonded in an octahedral geometry to three equivalent O(1) and three equivalent O(2) atoms. All Na(2)-O(1) bond lengths are 2.52 Å. All Na(2)-O(2) bond lengths are 2.41 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal non-coplanar geometry to one N(1), one H(2), and one H(3) atom. The C(1)-N(1) bond length is 1.49 Å. The C(1)-H(2) bond length is 1.10 Å. The C(1)-H(3) bond length is 1.10 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(2)-O(1) bond length is 1.27 Å. The C(2)-O(2) bond length is 1.26 Å. N(1) is bonded in a distorted tetrahedral geometry to three equivalent C(1) and one H(1) atom. The N(1)-H(1) bond length is 1.05 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Na(1) and one N(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(1) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Na(1), one Na(2), and one C(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one C(2) atom. Linkers: 4 [O]C(=O)C[NH](CC(=O)[O])CC(=O)[O]. Metal clusters: 8 [Na]. The MOF has largest included sphere 1.75 A, density 1.87 g/cm3, surface area 2440.93 m2/g, accessible volume 0.04 cm3/g