CaH17(C5O6)2H(CO)2 is Indium-derived structured and crystallizes in the monoclinic P2_1 space group. The structure is zero-dimensional and consists of two methyl formate molecules and two CaH17(C5O6)2 clusters. In each CaH17(C5O6)2 cluster, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(13), one O(14), one O(2), one O(7), one O(8), and one O(9) atom. The Ca(1)-O(1) bond length is 2.42 Å. The Ca(1)-O(11) bond length is 2.52 Å. The Ca(1)-O(13) bond length is 2.54 Å. The Ca(1)-O(14) bond length is 2.45 Å. The Ca(1)-O(2) bond length is 2.44 Å. The Ca(1)-O(7) bond length is 2.52 Å. The Ca(1)-O(8) bond length is 2.45 Å. The Ca(1)-O(9) bond length is 2.41 Å. There are ten inequivalent C sites. In the first C site, C(2) is bonded in a distorted single-bond geometry to one O(4) atom. The C(2)-O(4) bond length is 1.37 Å. In the second C site, C(3) is bonded in a distorted single-bond geometry to one O(5) atom. The C(3)-O(5) bond length is 1.29 Å. In the third C site, C(5) is bonded in a distorted water-like geometry to one H(7) and one O(7) atom. The C(5)-H(7) bond length is 1.11 Å. The C(5)-O(7) bond length is 1.43 Å. In the fourth C site, C(6) is bonded in a distorted trigonal non-coplanar geometry to one H(10), one H(9), and one O(8) atom. The C(6)-H(10) bond length is 1.10 Å. The C(6)-H(9) bond length is 1.10 Å. The C(6)-O(8) bond length is 1.43 Å. In the fifth C site, C(7) is bonded in a distorted bent 120 degrees geometry to one O(12) and one O(9) atom. The C(7)-O(12) bond length is 1.38 Å. The C(7)-O(9) bond length is 1.24 Å. In the sixth C site, C(8) is bonded in a distorted single-bond geometry to one O(10) atom. The C(8)-O(10) bond length is 1.36 Å. In the seventh C site, C(9) is bonded in a distorted single-bond geometry to one O(11) atom. The C(9)-O(11) bond length is 1.30 Å. In the eighth C site, C(10) is bonded in a distorted water-like geometry to one H(13) and one O(12) atom. The C(10)-H(13) bond length is 1.10 Å. The C(10)-O(12) bond length is 1.45 Å. In the ninth C site, C(11) is bonded in a distorted water-like geometry to one H(14) and one O(13) atom. The C(11)-H(14) bond length is 1.10 Å. The C(11)-O(13) bond length is 1.44 Å. In the tenth C site, C(12) is bonded in a distorted trigonal non-coplanar geometry to one H(16), one H(17), and one O(14) atom. The C(12)-H(16) bond length is 1.10 Å. The C(12)-H(17) bond length is 1.10 Å. The C(12)-O(14) bond length is 1.43 Å. There are seventeen inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.99 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(1) and one O(5) atom. The H(2)-O(1) bond length is 1.00 Å. The H(2)-O(5) bond length is 1.68 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(2) atom. The H(3)-O(2) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(2) atom. The H(4)-O(2) bond length is 0.98 Å. In the fifth H site, H(5) is bonded in a distorted bent 150 degrees geometry to one O(11) and one O(4) atom. The H(5)-O(11) bond length is 1.47 Å. The H(5)-O(4) bond length is 1.06 Å. In the sixth H site, H(7) is bonded in a single-bond geometry to one C(5) atom. In the seventh H site, H(8) is bonded in a single-bond geometry to one O(7) atom. The H(8)-O(7) bond length is 0.98 Å. In the eighth H site, H(9) is bonded in a single-bond geometry to one C(6) atom. In the ninth H site, H(10) is bonded in a single-bond geometry to one C(6) atom. In the tenth H site, H(11) is bonded in a single-bond geometry to one O(8) atom. The H(11)-O(8) bond length is 0.98 Å. In the eleventh H site, H(12) is bonded in a linear geometry to one O(10) and one O(5) atom. The H(12)-O(10) bond length is 1.03 Å. The H(12)-O(5) bond length is 1.51 Å. In the twelfth H site, H(13) is bonded in a single-bond geometry to one C(10) atom. In the thirteenth H site, H(14) is bonded in a single-bond geometry to one C(11) atom. In the fourteenth H site, H(15) is bonded in a single-bond geometry to one O(13) atom. The H(15)-O(13) bond length is 1.00 Å. In the fifteenth H site, H(16) is bonded in a single-bond geometry to one C(12) atom. In the sixteenth H site, H(17) is bonded in a single-bond geometry to one C(12) atom. In the seventeenth H site, H(18) is bonded in a single-bond geometry to one O(14) atom. The H(18)-O(14) bond length is 0.99 Å. There are twelve inequivalent O sites. In the first 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 second O site, O(2) is bonded in a distorted water-like geometry to one Ca(1), one H(3), and one H(4) atom. In the third O site, O(4) is bonded in a 2-coordinate geometry to one C(2) and one H(5) atom. In the fourth O site, O(5) is bonded in a distorted trigonal planar geometry to one C(3), one H(12), and one H(2) atom. In the fifth O site, O(7) is bonded in a distorted water-like geometry to one Ca(1), one C(5), and one H(8) atom. In the sixth O site, O(8) is bonded in a 2-coordinate geometry to one Ca(1), one C(6), and one H(11) atom. In the seventh O site, O(9) is bonded in a distorted single-bond geometry to one Ca(1) and one C(7) atom. In the eighth O site, O(10) is bonded in a distorted water-like geometry to one C(8) and one H(12) atom. In the ninth O site, O(11) is bonded in a distorted trigonal planar geometry to one Ca(1), one C(9), and one H(5) atom. In the tenth O site, O(12) is bonded in a water-like geometry to one C(10) and one C(7) atom. In the eleventh O site, O(13) is bonded in a distorted water-like geometry to one Ca(1), one C(11), and one H(15) atom. In the twelfth O site, O(14) is bonded in a 2-coordinate geometry to one Ca(1), one C(12), and one H(18) atom. Linkers: 2 [O]C1=C(O)C(=O)O[C@@H]1[C@@H](O)CO. Metal clusters: 2 [Ca]. The MOF has largest included sphere 1.96 A, density 1.80 g/cm3, surface area 3658.57 m2/g, accessible volume 0.06 cm3/g