ErC12H4(NO4)2(CH)2 crystallizes in the orthorhombic Fddd space group. The structure consists of thirty-two 02329_fluka molecules inside a ErC12H4(NO4)2 framework. In the ErC12H4(NO4)2 framework, Er(1) is bonded in a 8-coordinate geometry to two equivalent N(1), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Er(1)-N(1) bond lengths are 2.52 Å. Both Er(1)-O(1) bond lengths are 2.28 Å. Both Er(1)-O(2) bond lengths are 2.35 Å. Both Er(1)-O(3) bond lengths are 2.31 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 C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-O(1) bond length is 1.24 Å. The C(1)-O(2) bond length is 1.25 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(4) atom. The C(2)-C(3) bond length is 1.37 Å. The C(2)-C(4) bond length is 1.35 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(1), and one H(1) atom. The C(3)-N(1) bond length is 1.33 Å. The C(3)-H(1) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(2) and one H(2) atom. The C(4)-H(2) bond length is 0.93 Å. In the fifth C site, C(6) is bonded in a distorted single-bond geometry to one N(1) atom. The C(6)-N(1) bond length is 1.31 Å. In the sixth C site, C(7) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(7)-O(3) bond length is 1.26 Å. The C(7)-O(4) bond length is 1.22 Å. N(1) is bonded in a trigonal planar geometry to one Er(1), one C(3), and one C(6) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Er(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Er(1) and one C(7) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(7) atom. Linkers: 32 [O]C(=O)c1ccc(C([O])=O)nc1. Metal clusters: 16 [Er]. The MOF has largest included sphere 6.14 A, density 1.60 g/cm3, surface area 2989.91 m2/g, accessible volume 0.28 cm3/g