NdC5O6(CH)2 crystallizes in the monoclinic P2_1/m space group. The structure consists of eight 02329_fluka molecules inside a NdC5O6 framework. In the NdC5O6 framework, there are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 9-coordinate geometry to one O(1), one O(7), one O(8), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. The Nd(1)-O(1) bond length is 2.68 Å. The Nd(1)-O(7) bond length is 2.50 Å. The Nd(1)-O(8) bond length is 2.56 Å. Both Nd(1)-O(3) bond lengths are 2.48 Å. Both Nd(1)-O(5) bond lengths are 2.58 Å. Both Nd(1)-O(6) bond lengths are 2.48 Å. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to one O(2), one O(7), one O(8), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. The Nd(2)-O(2) bond length is 2.68 Å. The Nd(2)-O(7) bond length is 2.57 Å. The Nd(2)-O(8) bond length is 2.50 Å. Both Nd(2)-O(4) bond lengths are 2.47 Å. Both Nd(2)-O(5) bond lengths are 2.48 Å. Both Nd(2)-O(6) bond lengths are 2.58 Å. There are six inequivalent C sites. In the first C site, C(7) is bonded in a distorted single-bond geometry to one O(7) atom. The C(7)-O(7) bond length is 1.32 Å. In the second C site, C(8) is bonded in a distorted single-bond geometry to one O(8) atom. The C(8)-O(8) bond length is 1.32 Å. In the third C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(5) atom. The C(1)-O(3) bond length is 1.28 Å. The C(1)-O(5) bond length is 1.31 Å. In the fourth C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(6) atom. The C(2)-O(4) bond length is 1.27 Å. The C(2)-O(6) bond length is 1.31 Å. In the fifth C site, C(3) is bonded in a distorted single-bond geometry to one O(1) atom. The C(3)-O(1) bond length is 1.39 Å. In the sixth C site, C(4) is bonded in a distorted single-bond geometry to one O(2) atom. The C(4)-O(2) bond length is 1.39 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Nd(1) and two equivalent C(3) atoms. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Nd(2) and two equivalent C(4) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Nd(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Nd(2) and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Nd(1), one Nd(2), and one C(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Nd(1), one Nd(2), and one C(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Nd(1), one Nd(2), and one C(7) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Nd(1), one Nd(2), and one C(8) atom. Linkers: 4 [O]C(=O)[C]1C=C([O])C=C(C([O])=O)O1. Metal clusters: 4 [Nd]. The MOF has largest included sphere 1.32 A, density 3.38 g/cm3, surface area 1268.12 m2/g, accessible volume 0.01 cm3/g