NdC4NO4 crystallizes in the orthorhombic P2_12_12_1 space group. Nd(1) is bonded in a 6-coordinate geometry to one N(1), one O(2), one O(3), one O(4), and two equivalent O(1) atoms. The Nd(1)-N(1) bond length is 2.66 Å. The Nd(1)-O(2) bond length is 2.49 Å. The Nd(1)-O(3) bond length is 2.39 Å. The Nd(1)-O(4) bond length is 2.47 Å. There is one shorter (2.52 Å) and one longer (2.78 Å) Nd(1)-O(1) bond length. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.53 Å. The C(1)-O(1) bond length is 1.24 Å. The C(1)-O(2) bond length is 1.29 Å. In the second C site, C(2) is bonded in a water-like geometry to one C(1) and one N(1) atom. The C(2)-N(1) bond length is 1.53 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(4) and one N(1) atom. The C(3)-C(4) bond length is 1.44 Å. The C(3)-N(1) bond length is 1.52 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(4)-O(3) bond length is 1.28 Å. The C(4)-O(4) bond length is 1.29 Å. N(1) is bonded in a distorted trigonal non-coplanar geometry to one Nd(1), one C(2), and one C(3) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Nd(1) and one C(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Nd(1) and one C(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Nd(1) and one C(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Nd(1) and one C(4) atom. Linkers: 4 [O]C(=O)[C][N][C]C([O])=O. Metal clusters: 4 [Nd]. RCSR code: ths. The MOF has largest included sphere 4.33 A, density 1.80 g/cm3, surface area 2784.03 m2/g, accessible volume 0.30 cm3/g