Ca2C13H9O10CHO crystallizes in the triclinic P-1 space group. The structure consists of two methanol molecules inside a Ca2C13H9O10 framework. In the Ca2C13H9O10 framework, there are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(7), and one O(9) atom. The Ca(1)-O(1) bond length is 2.34 Å. The Ca(1)-O(2) bond length is 2.41 Å. The Ca(1)-O(4) bond length is 2.34 Å. The Ca(1)-O(5) bond length is 2.42 Å. The Ca(1)-O(7) bond length is 2.42 Å. The Ca(1)-O(9) bond length is 2.35 Å. In the second Ca site, Ca(2) is bonded in a distorted pentagonal bipyramidal geometry to one O(1), one O(10), one O(11), one O(2), one O(3), one O(4), and one O(9) atom. The Ca(2)-O(1) bond length is 2.38 Å. The Ca(2)-O(10) bond length is 2.59 Å. The Ca(2)-O(11) bond length is 2.50 Å. The Ca(2)-O(2) bond length is 2.36 Å. The Ca(2)-O(3) bond length is 2.48 Å. The Ca(2)-O(4) bond length is 2.34 Å. The Ca(2)-O(9) bond length is 2.39 Å. There are thirteen 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 1.46 Å. The C(1)-O(1) bond length is 1.29 Å. The C(1)-O(2) bond length is 1.29 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(7) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(7) 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 1.38 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one O(4) atom. The C(5)-O(4) bond length is 1.32 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one O(5) atom. The C(6)-O(5) bond length is 1.38 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(2) and one H(4) atom. The C(7)-H(4) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(9), one O(6), and one O(7) atom. The C(8)-C(9) bond length is 1.47 Å. The C(8)-O(6) bond length is 1.30 Å. The C(8)-O(7) bond length is 1.28 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(14), and one C(8) atom. The C(9)-C(10) bond length is 1.40 Å. The C(9)-C(14) bond length is 1.41 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(9) and one H(5) atom. The C(10)-H(5) bond length is 1.09 Å. In the eleventh C site, C(12) is bonded in a distorted single-bond geometry to one O(9) atom. The C(12)-O(9) bond length is 1.33 Å. In the twelfth C site, C(13) is bonded in a distorted single-bond geometry to one C(14) and one O(10) atom. The C(13)-C(14) bond length is 1.39 Å. The C(13)-O(10) bond length is 1.40 Å. In the thirteenth C site, C(14) is bonded in a distorted trigonal planar geometry to one C(13), one C(9), and one H(8) atom. The C(14)-H(8) bond length is 1.09 Å. There are nine 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 distorted single-bond geometry to one O(3) and one O(6) atom. The H(2)-O(3) bond length is 1.01 Å. The H(2)-O(6) bond length is 1.63 Å. In the third H site, H(3) is bonded in a distorted linear geometry to one O(5) and one O(6) atom. The H(3)-O(5) bond length is 1.03 Å. The H(3)-O(6) bond length is 1.57 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(7) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(10) atom. In the sixth H site, H(7) is bonded in a single-bond geometry to one O(10) atom. The H(7)-O(10) bond length is 0.97 Å. In the seventh H site, H(8) is bonded in a single-bond geometry to one C(14) atom. In the eighth H site, H(9) is bonded in a single-bond geometry to one O(11) atom. The H(9)-O(11) bond length is 0.97 Å. In the ninth H site, H(10) is bonded in a distorted single-bond geometry to one O(11) and one O(7) atom. The H(10)-O(11) bond length is 1.01 Å. The H(10)-O(7) bond length is 1.68 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ca(2), and one C(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ca(1), one Ca(2), and one C(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(2), one C(4), and one H(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ca(1), one Ca(2), and one C(5) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ca(1), one C(6), and one H(3) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one C(8), one H(2), and one H(3) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ca(1), one C(8), and one H(10) atom. In the eighth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1), one Ca(2), and one C(12) atom. In the ninth O site, O(10) is bonded in a 2-coordinate geometry to one Ca(2), one C(13), and one H(7) atom. In the tenth O site, O(11) is bonded in a distorted water-like geometry to one Ca(2), one H(10), and one H(9) atom. Linkers: 4 [O]C(=O)c1cc(O)c([O])c(O)c1. Metal clusters: 4 [Ca]. The MOF has largest included sphere 2.77 A, density 1.84 g/cm3, surface area 2877.11 m2/g, accessible volume 0.13 cm3/g