NaBH4(C3O5)2(CH2)2 crystallizes in the monoclinic P2_1 space group. The structure consists of four 02329_fluka molecules inside a NaBH4(C3O5)2 framework. In the NaBH4(C3O5)2 framework, Na(1) is bonded to one O(1), one O(3), one O(7), one O(8), and one O(9) atom to form NaO5 trigonal bipyramids that share corners with two equivalent B(1)O4 tetrahedra. The Na(1)-O(1) bond length is 2.29 Å. The Na(1)-O(3) bond length is 2.28 Å. The Na(1)-O(7) bond length is 2.36 Å. The Na(1)-O(8) bond length is 2.33 Å. The Na(1)-O(9) bond length is 2.30 Å. B(1) is bonded to one O(10), one O(3), one O(4), and one O(8) atom to form BO4 tetrahedra that share corners with two equivalent Na(1)O5 trigonal bipyramids. The B(1)-O(10) bond length is 1.53 Å. The B(1)-O(3) bond length is 1.45 Å. The B(1)-O(4) bond length is 1.50 Å. The B(1)-O(8) bond length is 1.45 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(7) atom. The C(1)-O(6) bond length is 1.34 Å. The C(1)-O(7) bond length is 1.23 Å. In the second C site, C(3) is bonded in a distorted water-like geometry to one H(5) and one O(8) atom. The C(3)-H(5) bond length is 1.11 Å. The C(3)-O(8) bond length is 1.42 Å. In the third C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(9) atom. The C(4)-O(10) bond length is 1.34 Å. The C(4)-O(9) bond length is 1.23 Å. In the fourth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(5)-O(1) bond length is 1.23 Å. The C(5)-O(2) bond length is 1.33 Å. In the fifth C site, C(7) is bonded in a distorted water-like geometry to one H(4) and one O(3) atom. The C(7)-H(4) bond length is 1.10 Å. The C(7)-O(3) bond length is 1.42 Å. In the sixth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(5) atom. The C(8)-O(4) bond length is 1.32 Å. The C(8)-O(5) bond length is 1.24 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(2) and one O(5) atom. The H(1)-O(2) bond length is 1.02 Å. The H(1)-O(5) bond length is 1.63 Å. In the second H site, H(4) is bonded in a single-bond geometry to one C(7) atom. In the third H site, H(5) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(8) is bonded in a single-bond geometry to one O(6) atom. The H(8)-O(6) bond length is 1.00 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Na(1) and one C(5) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one C(5) and one H(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one B(1), and one C(7) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one B(1) and one C(8) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one C(8) and one H(1) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one C(1) and one H(8) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one C(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Na(1), one B(1), and one C(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one C(4) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one B(1) and one C(4) atom. Linkers: 2 OC(=O)C[C@@H]1O[B@]2(OC1=O)OC(=O)[C@@H](O2)CC(=O)O. Metal clusters: 2 [Na]. The MOF has largest included sphere 2.08 A, density 1.70 g/cm3, surface area 3632.53 m2/g, accessible volume 0.12 cm3/g