Na4ZnH2(C4O7)2(CH2)4 crystallizes in the monoclinic P2_1/c space group. The structure consists of eight 02329_fluka molecules inside a Na4ZnH2(C4O7)2 framework. In the Na4ZnH2(C4O7)2 framework, there are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(3), one O(4), one O(7), and two equivalent O(6) atoms to form distorted NaO6 octahedra that share  a cornercorner with one Zn(1)O6 octahedra, corners with two equivalent Na(2)O5 trigonal bipyramids,  an edgeedge with one Na(1)O6 octahedra, and  an edgeedge with one Na(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 61°. The Na(1)-O(2) bond length is 2.40 Å. The Na(1)-O(3) bond length is 2.36 Å. The Na(1)-O(4) bond length is 2.47 Å. The Na(1)-O(7) bond length is 2.58 Å. There is one shorter (2.53 Å) and one longer (2.55 Å) Na(1)-O(6) bond length. In the second Na site, Na(2) is bonded to one O(3), one O(4), one O(5), and two equivalent O(7) atoms to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Zn(1)O6 octahedra, corners with two equivalent Na(1)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra, and  an edgeedge with one Na(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 62-79°. The Na(2)-O(3) bond length is 2.42 Å. The Na(2)-O(4) bond length is 2.40 Å. The Na(2)-O(5) bond length is 2.30 Å. There is one shorter (2.34 Å) and one longer (2.48 Å) Na(2)-O(7) bond length. Zn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with two equivalent Na(1)O6 octahedra and corners with two equivalent Na(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 61°. Both Zn(1)-O(1) bond lengths are 2.10 Å. Both Zn(1)-O(2) bond lengths are 2.10 Å. Both Zn(1)-O(5) bond lengths are 2.10 Å. There are four inequivalent C sites. In the first C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(3) atom. The C(2)-O(2) bond length is 1.29 Å. The C(2)-O(3) bond length is 1.26 Å. In the second C site, C(4) is bonded in a distorted single-bond geometry to one O(1) atom. The C(4)-O(1) bond length is 1.45 Å. In the third C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(7) atom. The C(6)-O(6) bond length is 1.29 Å. The C(6)-O(7) bond length is 1.26 Å. In the fourth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(5) atom. The C(1)-O(4) bond length is 1.26 Å. The C(1)-O(5) bond length is 1.28 Å. H(5) is bonded in a linear geometry to one O(1) and one O(6) atom. The H(5)-O(1) bond length is 1.03 Å. The H(5)-O(6) bond length is 1.55 Å. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a distorted single-bond geometry to one Na(1), one Na(2), and one C(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1), one Zn(1), and one C(2) atom. In the third O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(2), one Zn(1), and one C(1) atom. In the fourth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Na(1), one C(6), and one H(5) atom. In the fifth O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one C(6) atom. In the sixth O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one C(4), and one H(5) atom. In the seventh O site, O(3) is bonded in a distorted single-bond geometry to one Na(1), one Na(2), and one C(2) atom. Linkers: 4 [O]C(=O)CC(O)(CC([O])=O)C([O])=O. Metal clusters: 8 [Na] ,2 [Zn]. The MOF has largest included sphere 1.09 A, density 2.24 g/cm3, surface area 1466.80 m2/g, accessible volume 0.02 cm3/g