CaH12(C2O)7(CH)2 crystallizes in the monoclinic P2_1/c space group. The structure consists of eight 02329_fluka molecules inside a CaH12(C2O)7 framework. In the CaH12(C2O)7 framework, Ca(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(6), one O(7), and two equivalent O(5) atoms. The Ca(1)-O(2) bond length is 2.61 Å. The Ca(1)-O(3) bond length is 2.48 Å. The Ca(1)-O(4) bond length is 2.40 Å. The Ca(1)-O(6) bond length is 2.28 Å. The Ca(1)-O(7) bond length is 2.41 Å. There is one shorter (2.31 Å) and one longer (2.42 Å) Ca(1)-O(5) bond length. There are fourteen inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(7) atom. The C(1)-C(2) bond length is 1.41 Å. The C(1)-C(6) bond length is 1.40 Å. The C(1)-C(7) bond length is 1.48 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1) and one H(1) atom. The C(2)-H(1) 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 O(1) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-O(1) bond length is 1.36 Å. In the fourth C site, C(5) is bonded in a trigonal planar geometry to one C(15), one C(4), and one C(6) atom. The C(5)-C(15) bond length is 1.50 Å. The C(5)-C(6) bond length is 1.40 Å. In the fifth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(3) atom. The C(6)-H(3) bond length is 1.09 Å. In the sixth C site, C(7) is bonded in a trigonal planar geometry to one C(1), one C(12), and one C(8) atom. The C(7)-C(12) bond length is 1.41 Å. The C(7)-C(8) bond length is 1.40 Å. In the seventh C site, C(8) is bonded in a distorted single-bond geometry to one C(7), one C(9), and one H(4) atom. The C(8)-C(9) bond length is 1.40 Å. The C(8)-H(4) bond length is 1.09 Å. In the eighth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(16), and one C(8) atom. The C(9)-C(10) bond length is 1.42 Å. The C(9)-C(16) bond length is 1.50 Å. In the ninth C site, C(10) is bonded in a distorted single-bond geometry to one C(9) and one O(2) atom. The C(10)-O(2) bond length is 1.37 Å. In the tenth C site, C(12) is bonded in a distorted single-bond geometry to one C(7) and one H(6) atom. The C(12)-H(6) bond length is 1.09 Å. In the eleventh C site, C(13) is bonded in a tetrahedral geometry to one H(7), one H(8), one H(9), and one O(1) atom. The C(13)-H(7) bond length is 1.10 Å. The C(13)-H(8) bond length is 1.10 Å. The C(13)-H(9) bond length is 1.10 Å. The C(13)-O(1) bond length is 1.43 Å. In the twelfth C site, C(14) is bonded in a tetrahedral geometry to one H(10), one H(11), one H(12), and one O(2) atom. The C(14)-H(10) bond length is 1.09 Å. The C(14)-H(11) bond length is 1.10 Å. The C(14)-H(12) bond length is 1.10 Å. The C(14)-O(2) bond length is 1.44 Å. In the thirteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(3), and one O(4) atom. The C(15)-O(3) bond length is 1.28 Å. The C(15)-O(4) bond length is 1.27 Å. In the fourteenth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one C(9), one O(5), and one O(6) atom. The C(16)-O(5) bond length is 1.28 Å. The C(16)-O(6) bond length is 1.27 Å. There are twelve inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(3) is bonded in a single-bond geometry to one C(6) atom. In the third H site, H(4) is bonded in a single-bond geometry to one C(8) atom. In the fourth H site, H(6) is bonded in a single-bond geometry to one C(12) atom. In the fifth H site, H(7) is bonded in a single-bond geometry to one C(13) atom. In the sixth H site, H(8) is bonded in a single-bond geometry to one C(13) atom. In the seventh H site, H(9) is bonded in a single-bond geometry to one C(13) atom. In the eighth H site, H(10) is bonded in a single-bond geometry to one C(14) atom. In the ninth H site, H(11) is bonded in a single-bond geometry to one C(14) atom. In the tenth H site, H(12) is bonded in a single-bond geometry to one C(14) atom. In the eleventh H site, H(13) is bonded in a distorted single-bond geometry to one O(3) and one O(7) atom. The H(13)-O(3) bond length is 1.68 Å. The H(13)-O(7) bond length is 1.00 Å. In the twelfth H site, H(14) is bonded in a single-bond geometry to one O(7) atom. The H(14)-O(7) bond length is 0.97 Å. There are seven inequivalent O sites. In the first O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one C(10), and one C(14) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to one Ca(1), one C(15), and one H(13) atom. In the third O site, O(4) is bonded in a distorted L-shaped geometry to one Ca(1) and one C(15) atom. In the fourth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one C(16) atom. In the fifth O site, O(6) is bonded in a distorted linear geometry to one Ca(1) and one C(16) atom. In the sixth O site, O(7) is bonded in a distorted water-like geometry to one Ca(1), one H(13), and one H(14) atom. In the seventh O site, O(1) is bonded in a bent 120 degrees geometry to one C(13) and one C(4) atom. Linkers: 2 COc1ccc(-c2c[c][c]c(C([O])=O)c2)cc1C([O])=O ,4 COc1ccc(-c2ccc(OC)c(C([O])=O)c2)cc1C([O])=O ,2 COc1ccc(-c2cc[c]c(C([O])=O)c2)cc1C([O])=O. Metal clusters: 4 [Ca]. The MOF has largest included sphere 3.49 A, density 1.46 g/cm3, surface area 4368.94 m2/g, accessible volume 0.10 cm3/g