CdC15H8O4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one O(2), one O(3), one O(7), one O(8), and two equivalent O(1) atoms to form distorted edge-sharing CdO6 pentagonal pyramids. The Cd(1)-O(2) bond length is 2.50 Å. The Cd(1)-O(3) bond length is 2.24 Å. The Cd(1)-O(7) bond length is 2.38 Å. The Cd(1)-O(8) bond length is 2.30 Å. There is one shorter (2.36 Å) and one longer (2.38 Å) Cd(1)-O(1) bond length. In the second Cd site, Cd(2) is bonded in a rectangular see-saw-like geometry to one O(2), one O(4), one O(6), and one O(7) atom. The Cd(2)-O(2) bond length is 2.35 Å. The Cd(2)-O(4) bond length is 2.23 Å. The Cd(2)-O(6) bond length is 2.19 Å. The Cd(2)-O(7) bond length is 2.35 Å. There are thirty inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(15), one C(2), and one C(9) atom. The C(1)-C(15) bond length is 1.49 Å. The C(1)-C(2) bond length is 1.35 Å. The C(1)-C(9) bond length is 1.49 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(21), and one C(3) atom. The C(2)-C(21) bond length is 1.49 Å. The C(2)-C(3) bond length is 1.49 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(8) atom. The C(3)-C(4) bond length is 1.37 Å. The C(3)-C(8) bond length is 1.38 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(1) atom. The C(4)-C(5) bond length is 1.37 Å. The C(4)-H(1) bond length is 0.95 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one H(2) atom. The C(5)-C(6) bond length is 1.38 Å. The C(5)-H(2) bond length is 0.95 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(29), one C(5), and one C(7) atom. The C(6)-C(29) bond length is 1.49 Å. The C(6)-C(7) bond length is 1.37 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(6) and one H(3) atom. The C(7)-H(3) bond length is 0.95 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(3) and one H(4) atom. The C(8)-H(4) bond length is 0.95 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(1), one C(10), and one C(14) atom. The C(9)-C(10) bond length is 1.39 Å. The C(9)-C(14) bond length is 1.38 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(11), one C(9), and one H(5) atom. The C(10)-C(11) bond length is 1.39 Å. The C(10)-H(5) bond length is 0.95 Å. In the eleventh C site, C(11) is bonded in a distorted trigonal planar geometry to one C(10), one C(12), and one H(6) atom. The C(11)-C(12) bond length is 1.38 Å. The C(11)-H(6) bond length is 0.95 Å. In the twelfth C site, C(12) is bonded in a trigonal planar geometry to one C(11), one C(13), and one C(28) atom. The C(12)-C(13) bond length is 1.38 Å. The C(12)-C(28) bond length is 1.51 Å. In the thirteenth C site, C(13) is bonded in a distorted trigonal planar geometry to one C(12), one C(14), and one H(7) atom. The C(13)-C(14) bond length is 1.39 Å. The C(13)-H(7) bond length is 0.95 Å. In the fourteenth C site, C(14) is bonded in a distorted single-bond geometry to one C(13), one C(9), and one H(8) atom. The C(14)-H(8) bond length is 0.95 Å. In the fifteenth C site, C(15) is bonded in a trigonal planar geometry to one C(1), one C(16), and one C(20) atom. The C(15)-C(16) bond length is 1.38 Å. The C(15)-C(20) bond length is 1.40 Å. In the sixteenth C site, C(16) is bonded in a distorted single-bond geometry to one C(15), one C(17), and one H(9) atom. The C(16)-C(17) bond length is 1.39 Å. The C(16)-H(9) bond length is 0.95 Å. In the seventeenth C site, C(17) is bonded in a distorted trigonal planar geometry to one C(16), one C(18), and one H(10) atom. The C(17)-C(18) bond length is 1.39 Å. The C(17)-H(10) bond length is 0.95 Å. In the eighteenth C site, C(18) is bonded in a trigonal planar geometry to one C(17), one C(19), and one C(27) atom. The C(18)-C(19) bond length is 1.39 Å. The C(18)-C(27) bond length is 1.49 Å. In the nineteenth C site, C(19) is bonded in a distorted trigonal planar geometry to one C(18), one C(20), and one H(11) atom. The C(19)-C(20) bond length is 1.39 Å. The C(19)-H(11) bond length is 0.95 Å. In the twentieth C site, C(20) is bonded in a distorted single-bond geometry to one C(15), one C(19), and one H(12) atom. The C(20)-H(12) bond length is 0.95 Å. In the twenty-first C site, C(21) is bonded in a trigonal planar geometry to one C(2), one C(22), and one C(26) atom. The C(21)-C(22) bond length is 1.39 Å. The C(21)-C(26) bond length is 1.39 Å. In the twenty-second C site, C(22) is bonded in a distorted single-bond geometry to one C(21), one C(23), and one H(13) atom. The C(22)-C(23) bond length is 1.39 Å. The C(22)-H(13) bond length is 0.95 Å. In the twenty-third C site, C(23) is bonded in a distorted trigonal planar geometry to one C(22), one C(24), and one H(14) atom. The C(23)-C(24) bond length is 1.37 Å. The C(23)-H(14) bond length is 0.95 Å. In the twenty-fourth C site, C(24) is bonded in a trigonal planar geometry to one C(23), one C(25), and one C(30) atom. The C(24)-C(25) bond length is 1.40 Å. The C(24)-C(30) bond length is 1.50 Å. In the twenty-fifth C site, C(25) is bonded in a distorted trigonal planar geometry to one C(24), one C(26), and one H(15) atom. The C(25)-C(26) bond length is 1.38 Å. The C(25)-H(15) bond length is 0.95 Å. In the twenty-sixth C site, C(26) is bonded in a distorted single-bond geometry to one C(21), one C(25), and one H(16) atom. The C(26)-H(16) bond length is 0.95 Å. In the twenty-seventh C site, C(27) is bonded in a bent 120 degrees geometry to one C(18), one O(1), and one O(2) atom. The C(27)-O(1) bond length is 1.26 Å. The C(27)-O(2) bond length is 1.27 Å. In the twenty-eighth C site, C(28) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(5), and one O(6) atom. The C(28)-O(5) bond length is 1.21 Å. The C(28)-O(6) bond length is 1.21 Å. In the twenty-ninth C site, C(29) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(7), and one O(8) atom. The C(29)-O(7) bond length is 1.26 Å. The C(29)-O(8) bond length is 1.25 Å. In the thirtieth C site, C(30) is bonded in a distorted bent 120 degrees geometry to one C(24), one O(3), and one O(4) atom. The C(30)-O(3) bond length is 1.27 Å. The C(30)-O(4) bond length is 1.24 Å. There are sixteen 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(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(8) 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(6) is bonded in a single-bond geometry to one C(11) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(13) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(14) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(16) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(17) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(19) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(20) atom. In the thirteenth H site, H(13) is bonded in a single-bond geometry to one C(22) atom. In the fourteenth H site, H(14) is bonded in a single-bond geometry to one C(23) atom. In the fifteenth H site, H(15) is bonded in a single-bond geometry to one C(25) atom. In the sixteenth H site, H(16) is bonded in a single-bond geometry to one C(26) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Cd(1) and one C(27) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Cd(1), one Cd(2), and one C(27) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cd(1) and one C(30) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cd(2) and one C(30) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one C(28) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Cd(2) and one C(28) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Cd(1), one Cd(2), and one C(29) atom. In the eighth O site, O(8) is bonded in an L-shaped geometry to one Cd(1) and one C(29) atom. Linkers: 4 [O]C(=O)c1ccc(C(=C(c2ccc(C([O])=O)cc2)c2ccc(C([O])=O)cc2)c2ccc(C([O])=O)cc2)cc1. Metal clusters: 2 O=[C]O[Cd@]12O[C]O[Cd](O[C]O1)O[C]O[Cd@]1(O[C]=O)O[C]O[Cd](O[C]O2)O[C]O1. RCSR code: scu. The MOF has largest included sphere 7.65 A, density 0.89 g/cm3, surface area 3852.70 m2/g, accessible volume 0.70 cm3/g