CsC6NH3O2 crystallizes in the orthorhombic Pnna space group. Cs(1) is bonded in a 6-coordinate geometry to one N(1), two equivalent O(1), and three equivalent O(2) atoms. The Cs(1)-N(1) bond length is 3.22 Å. There is one shorter (2.96 Å) and one longer (3.18 Å) Cs(1)-O(1) bond length. There are a spread of Cs(1)-O(2) bond distances ranging from 2.92-3.24 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(1), one C(2), and one N(1) atom. The C(1)-C(1) bond length is 1.49 Å. The C(1)-C(2) bond length is 1.41 Å. The C(1)-N(1) bond length is 1.35 Å. In the second C site, C(5) is bonded in a distorted single-bond geometry to one C(6) and one H(2) atom. The C(5)-C(6) bond length is 1.40 Å. The C(5)-H(2) bond length is 1.09 Å. In the third 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 1.51 Å. The C(2)-C(4) bond length is 1.40 Å. In the fourth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(5), 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 fifth C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(3)-O(1) bond length is 1.26 Å. The C(3)-O(2) bond length is 1.27 Å. In the sixth C site, C(4) is bonded in a distorted single-bond geometry to one C(2) and one H(1) atom. The C(4)-H(1) bond length is 1.09 Å. N(1) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one C(1), and one C(6) atom. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(4) 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. There are two inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to three equivalent Cs(1) and one C(3) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Cs(1) and one C(3) atom. Linkers: 4 [O]C(=O)c1cccnc1-c1ncccc1C([O])=O. Metal clusters: 8 [Cs]. The MOF has largest included sphere 2.49 A, density 2.16 g/cm3, surface area 3070.84 m2/g, accessible volume 0.13 cm3/g