ErC8NH6O8 crystallizes in the triclinic P-1 space group. Er(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The Er(1)-O(1) bond length is 2.23 Å. The Er(1)-O(2) bond length is 2.45 Å. The Er(1)-O(3) bond length is 2.20 Å. The Er(1)-O(4) bond length is 2.41 Å. The Er(1)-O(5) bond length is 2.38 Å. The Er(1)-O(6) bond length is 2.33 Å. The Er(1)-O(7) bond length is 2.43 Å. The Er(1)-O(8) bond length is 2.44 Å. There are eight 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 1.27 Å. The C(1)-O(2) bond length is 1.27 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(6) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-C(6) bond length is 1.40 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one H(1) atom. The C(3)-H(1) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one O(3) atom. The C(4)-O(3) bond length is 1.30 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(2) atom. The C(5)-N(1) bond length is 1.35 Å. The C(5)-H(2) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one H(3) atom. The C(6)-N(1) bond length is 1.34 Å. The C(6)-H(3) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(5) atom. The C(7)-O(4) bond length is 1.25 Å. The C(7)-O(5) bond length is 1.28 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(7) atom. The C(8)-O(6) bond length is 1.28 Å. The C(8)-O(7) bond length is 1.25 Å. N(1) is bonded in a trigonal planar geometry to one C(5), one C(6), and one H(4) atom. The N(1)-H(4) bond length is 1.05 Å. There are six 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(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to one N(1) and one O(6) atom. The H(4)-O(6) bond length is 1.70 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(8) atom. The H(5)-O(8) bond length is 0.97 Å. In the sixth H site, H(6) is bonded in a distorted single-bond geometry to one O(5) and one O(8) atom. The H(6)-O(5) bond length is 1.65 Å. The H(6)-O(8) bond length is 1.01 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Er(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Er(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one C(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Er(1) and one C(7) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Er(1), one C(7), and one H(6) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Er(1), one C(8), and one H(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Er(1) and one C(8) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one Er(1), one H(5), and one H(6) atom. Linkers: 2 [O]C(=O)C1=CC([O])=CN[CH]1 ,2 [O]C(=O)C([O])=O. Metal clusters: 2 [Er]. The MOF has largest included sphere 2.73 A, density 2.58 g/cm3, surface area 2443.61 m2/g, accessible volume 0.07 cm3/g