NaCu2H(CO2)6(CH3)6 crystallizes in the monoclinic C2/c space group. The structure consists of twenty-four 02329_fluka molecules inside a NaCu2H(CO2)6 framework. In the NaCu2H(CO2)6 framework, Na(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms to form distorted NaO6 octahedra that share edges with two equivalent Cu(1)O5 square pyramids. Both Na(1)-O(1) bond lengths are 2.41 Å. Both Na(1)-O(2) bond lengths are 2.39 Å. Both Na(1)-O(6) bond lengths are 2.38 Å. Cu(1) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(6) atom to form distorted CuO5 square pyramids that share  an edgeedge with one Na(1)O6 octahedra. The Cu(1)-O(1) bond length is 2.20 Å. The Cu(1)-O(3) bond length is 2.00 Å. The Cu(1)-O(4) bond length is 2.00 Å. The Cu(1)-O(5) bond length is 1.98 Å. The Cu(1)-O(6) bond length is 2.01 Å. There are three inequivalent C sites. In the first C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(3)-O(3) bond length is 1.28 Å. The C(3)-O(4) bond length is 1.27 Å. In the second C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(5)-O(5) bond length is 1.28 Å. The C(5)-O(6) bond length is 1.28 Å. In the third C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.30 Å. H(10) is bonded in a linear geometry to two equivalent O(2) atoms. Both H(10)-O(2) bond lengths are 1.22 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Cu(1), and one C(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one C(1), and one H(10) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(3) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(3) atom. In the fifth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(1), one Cu(1), and one C(5) atom. In the sixth O site, O(5) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(5) atom. Linkers: 12 CC([O])=O. Metal clusters: 2 [Na] ,4 [Cu]. The MOF has largest included sphere 2.21 A, density 1.74 g/cm3, surface area 4050.54 m2/g, accessible volume 0.14 cm3/g