Ca2C12N2H10O11(CH)2 crystallizes in the monoclinic C2/c space group. The structure consists of eight 02329_fluka molecules inside a Ca2C12N2H10O11 framework. In the Ca2C12N2H10O11 framework, Ca(1) is bonded to one N(1), one O(1), one O(2), two equivalent O(3), and two equivalent O(5) atoms to form a mixture of distorted face and edge-sharing CaNO6 pentagonal bipyramids. The Ca(1)-N(1) bond length is 2.51 Å. The Ca(1)-O(1) bond length is 2.29 Å. The Ca(1)-O(2) bond length is 2.44 Å. There is one shorter (2.39 Å) and one longer (2.43 Å) Ca(1)-O(3) bond length. There is one shorter (2.40 Å) and one longer (2.49 Å) Ca(1)-O(5) bond length. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one C(6), and one N(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.51 Å. The C(1)-N(1) bond length is 1.34 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1) and one H(4) atom. The C(2)-H(4) bond length is 1.09 Å. In the third C site, C(4) is bonded in a distorted single-bond geometry to one C(5) and one H(6) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-H(6) bond length is 1.09 Å. In the fourth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(7), and one N(1) atom. The C(5)-C(7) bond length is 1.51 Å. The C(5)-N(1) bond length is 1.34 Å. In the fifth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(3), and one O(4) atom. The C(6)-O(3) bond length is 1.29 Å. The C(6)-O(4) bond length is 1.26 Å. In the sixth C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(5), and one O(6) atom. The C(7)-O(5) bond length is 1.28 Å. The C(7)-O(6) bond length is 1.27 Å. N(1) is bonded in a trigonal planar geometry to one Ca(1), one C(1), and one C(5) atom. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) and one O(6) atom. The H(1)-O(1) bond length is 1.00 Å. The H(1)-O(6) bond length is 1.72 Å. In the second H site, H(2) is bonded in a distorted linear geometry to one O(1) and one O(6) atom. The H(2)-O(1) bond length is 0.99 Å. The H(2)-O(6) bond length is 1.67 Å. In the third H site, H(3) is bonded in a distorted linear geometry to one O(2) and one O(4) atom. The H(3)-O(2) bond length is 1.02 Å. The H(3)-O(4) bond length is 1.61 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(2) atom. In the fifth H site, H(6) is bonded in a single-bond geometry to one C(4) atom. There are six inequivalent O sites. In the first O site, O(4) is bonded in a water-like geometry to one C(6) and one H(3) atom. In the second O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one C(7) atom. In the third O site, O(6) is bonded in a 3-coordinate geometry to one C(7), one H(1), and one H(2) atom. In the fourth O site, O(1) is bonded in a distorted water-like geometry to one Ca(1), one H(1), and one H(2) atom. In the fifth O site, O(2) is bonded in a distorted water-like geometry to two equivalent Ca(1) and two equivalent H(3) atoms. In the sixth O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one C(6) atom. Linkers: 4 [O]C(=O)c1cccc(C([O])=O)n1 ,2 O. Metal clusters: 4 [Ca]. The MOF has largest included sphere 1.88 A, density 1.71 g/cm3, surface area 3896.77 m2/g, accessible volume 0.13 cm3/g