CaC21N3H19O8 crystallizes in the triclinic P-1 space group. The structure consists of a CaC21N3H19O8 framework. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(14), one O(25), one O(29), one O(4), and one O(5) atom. The Ca(1)-O(1) bond length is 2.76 Å. The Ca(1)-O(10) bond length is 2.67 Å. The Ca(1)-O(11) bond length is 2.39 Å. The Ca(1)-O(14) bond length is 2.44 Å. The Ca(1)-O(25) bond length is 2.45 Å. The Ca(1)-O(29) bond length is 2.44 Å. The Ca(1)-O(4) bond length is 2.36 Å. The Ca(1)-O(5) bond length is 2.40 Å. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(15), one O(2), one O(26), one O(30), and one O(6) atom. The Ca(2)-O(1) bond length is 2.36 Å. The Ca(2)-O(11) bond length is 2.67 Å. The Ca(2)-O(12) bond length is 2.39 Å. The Ca(2)-O(15) bond length is 2.44 Å. The Ca(2)-O(2) bond length is 2.77 Å. The Ca(2)-O(26) bond length is 2.44 Å. The Ca(2)-O(30) bond length is 2.44 Å. The Ca(2)-O(6) bond length is 2.40 Å. In the third Ca site, Ca(3) is bonded in a 8-coordinate geometry to one O(12), one O(16), one O(2), one O(27), one O(3), one O(31), one O(7), and one O(9) atom. The Ca(3)-O(12) bond length is 2.67 Å. The Ca(3)-O(16) bond length is 2.44 Å. The Ca(3)-O(2) bond length is 2.36 Å. The Ca(3)-O(27) bond length is 2.45 Å. The Ca(3)-O(3) bond length is 2.77 Å. The Ca(3)-O(31) bond length is 2.44 Å. The Ca(3)-O(7) bond length is 2.40 Å. The Ca(3)-O(9) bond length is 2.39 Å. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(28), one O(3), one O(32), one O(4), one O(8), and one O(9) atom. The Ca(4)-O(10) bond length is 2.39 Å. The Ca(4)-O(13) bond length is 2.44 Å. The Ca(4)-O(28) bond length is 2.45 Å. The Ca(4)-O(3) bond length is 2.36 Å. The Ca(4)-O(32) bond length is 2.44 Å. The Ca(4)-O(4) bond length is 2.77 Å. The Ca(4)-O(8) bond length is 2.41 Å. The Ca(4)-O(9) bond length is 2.67 Å. There are forty-seven inequivalent C sites. In the first C site, C(1,3) is bonded in a distorted bent 120 degrees geometry to one C(9,11,12); one O(1); and one O(5) atom. The C(1,3)-C(9,11,12) bond length is 1.50 Å. The C(1,3)-O(1) bond length is 1.27 Å. The C(1,3)-O(5) bond length is 1.27 Å. In the second C site, C(2,4) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(2), and one O(6) atom. The C(2,4)-C(10) bond length is 1.50 Å. The C(2,4)-O(2) bond length is 1.27 Å. The C(2,4)-O(6) bond length is 1.27 Å. In the third C site, C(5,8) is bonded in a bent 120 degrees geometry to one C(17), one O(13), and one O(9) atom. The C(5,8)-C(17) bond length is 1.50 Å. The C(5,8)-O(13) bond length is 1.27 Å. The C(5,8)-O(9) bond length is 1.28 Å. In the fourth C site, C(6,7) is bonded in a bent 120 degrees geometry to one C(18), one O(10), and one O(14) atom. The C(6,7)-C(18) bond length is 1.50 Å. The C(6,7)-O(10) bond length is 1.28 Å. The C(6,7)-O(14) bond length is 1.27 Å. In the fifth C site, C(9,11,12) is bonded in a trigonal planar geometry to one C(1,3); one C(13); and one C(29) atom. The C(9,11,12)-C(13) bond length is 1.40 Å. The C(9,11,12)-C(29) bond length is 1.40 Å. In the sixth C site, C(10) is bonded in a trigonal planar geometry to one C(14); one C(2,4); and one C(30) atom. The C(10)-C(14) bond length is 1.40 Å. The C(10)-C(30) bond length is 1.40 Å. In the seventh C site, C(13) is bonded in a distorted single-bond geometry to one C(17); one C(9,11,12); and one H(1,2,3,4) atom. The C(13)-C(17) bond length is 1.40 Å. The C(13)-H(1,2,3,4) bond length is 1.09 Å. In the eighth C site, C(14) is bonded in a distorted single-bond geometry to one C(10); one C(18); and one H(1,2,3,4) atom. The C(14)-C(18) bond length is 1.40 Å. The C(14)-H(1,2,3,4) bond length is 1.09 Å. In the ninth C site, C(15) is bonded in a distorted single-bond geometry to one C(19); one C(9,11,12); and one H(1,2,3,4) atom. The C(15)-C(19) bond length is 1.40 Å. The C(15)-C(9,11,12) bond length is 1.40 Å. The C(15)-H(1,2,3,4) bond length is 1.09 Å. In the tenth C site, C(16) is bonded in a distorted single-bond geometry to one C(20); one C(9,11,12); and one H(1,2,3,4) atom. The C(16)-C(20) bond length is 1.40 Å. The C(16)-C(9,11,12) bond length is 1.40 Å. The C(16)-H(1,2,3,4) bond length is 1.09 Å. In the eleventh C site, C(17) is bonded in a trigonal planar geometry to one C(13); one C(21); and one C(5,8) atom. The C(17)-C(21) bond length is 1.40 Å. In the twelfth C site, C(18) is bonded in a trigonal planar geometry to one C(14); one C(22); and one C(6,7) atom. The C(18)-C(22) bond length is 1.40 Å. In the thirteenth C site, C(19) is bonded in a trigonal planar geometry to one C(15); one C(23); and one C(6,7) atom. The C(19)-C(23) bond length is 1.40 Å. The C(19)-C(6,7) bond length is 1.50 Å. In the fourteenth C site, C(20) is bonded in a trigonal planar geometry to one C(16); one C(24); and one C(5,8) atom. The C(20)-C(24) bond length is 1.40 Å. The C(20)-C(5,8) bond length is 1.50 Å. In the fifteenth C site, C(21) is bonded in a distorted single-bond geometry to one C(17); one C(25,26,27,28); and one H(5,6,7,8) atom. The C(21)-C(25,26,27,28) bond length is 1.39 Å. The C(21)-H(5,6,7,8) bond length is 1.09 Å. In the sixteenth C site, C(22) is bonded in a distorted single-bond geometry to one C(18); one C(25,26,27,28); and one H(5,6,7,8) atom. The C(22)-C(25,26,27,28) bond length is 1.39 Å. The C(22)-H(5,6,7,8) bond length is 1.09 Å. In the seventeenth C site, C(23) is bonded in a distorted single-bond geometry to one C(19); one C(25,26,27,28); and one H(5,6,7,8) atom. The C(23)-C(25,26,27,28) bond length is 1.39 Å. The C(23)-H(5,6,7,8) bond length is 1.09 Å. In the eighteenth C site, C(24) is bonded in a distorted single-bond geometry to one C(20); one C(25,26,27,28); and one H(5,6,7,8) atom. The C(24)-C(25,26,27,28) bond length is 1.39 Å. The C(24)-H(5,6,7,8) bond length is 1.09 Å. In the nineteenth C site, C(25,26,27,28) is bonded in a distorted trigonal planar geometry to one C(21), one C(29), and one N(1) atom. The C(25,26,27,28)-C(29) bond length is 1.39 Å. The C(25,26,27,28)-N(1) bond length is 1.44 Å. In the twentieth C site, C(29) is bonded in a distorted single-bond geometry to one C(25,26,27,28); one C(9,11,12); and one H(9,10,11,12) atom. The C(29)-H(9,10,11,12) bond length is 1.09 Å. In the twenty-first C site, C(30) is bonded in a distorted single-bond geometry to one C(10); one C(25,26,27,28); and one H(9,10,11,12) atom. The C(30)-C(25,26,27,28) bond length is 1.39 Å. The C(30)-H(9,10,11,12) bond length is 1.09 Å. In the twenty-second C site, C(31) is bonded in a distorted single-bond geometry to one C(25,26,27,28); one C(9,11,12); and one H(9,10,11,12) atom. The C(31)-C(25,26,27,28) bond length is 1.39 Å. The C(31)-C(9,11,12) bond length is 1.40 Å. The C(31)-H(9,10,11,12) bond length is 1.09 Å. In the twenty-third C site, C(32) is bonded in a distorted single-bond geometry to one C(25,26,27,28); one C(9,11,12); and one H(9,10,11,12) atom. The C(32)-C(25,26,27,28) bond length is 1.39 Å. The C(32)-C(9,11,12) bond length is 1.40 Å. The C(32)-H(9,10,11,12) bond length is 1.09 Å. In the twenty-fourth C site, C(33,34,35,36) is bonded in a distorted bent 120 degrees geometry to one C(53,54); one N(1); and one O(17,18) atom. The C(33,34,35,36)-C(53,54) bond length is 1.48 Å. The C(33,34,35,36)-N(1) bond length is 1.41 Å. The C(33,34,35,36)-O(17,18) bond length is 1.23 Å. In the twenty-fifth C site, C(37,38,39) is bonded in a distorted bent 120 degrees geometry to one C(45,46); one N(1); and one O(21,22) atom. The C(37,38,39)-C(45,46) bond length is 1.48 Å. The C(37,38,39)-N(1) bond length is 1.41 Å. The C(37,38,39)-O(21,22) bond length is 1.23 Å. In the twenty-sixth C site, C(40) is bonded in a distorted bent 120 degrees geometry to one C(47,48); one N(4); and one O(23,24) atom. The C(40)-C(47,48) bond length is 1.48 Å. The C(40)-N(4) bond length is 1.41 Å. The C(40)-O(23,24) bond length is 1.23 Å. In the twenty-seventh C site, C(41,42,43) is bonded in a distorted single-bond geometry to one C(45,46) and one H(13,14,15,16) atom. The C(41,42,43)-C(45,46) bond length is 1.39 Å. The C(41,42,43)-H(13,14,15,16) bond length is 1.09 Å. In the twenty-eighth C site, C(44) is bonded in a distorted single-bond geometry to one C(47,48) and one H(13,14,15,16) atom. The C(44)-C(47,48) bond length is 1.39 Å. The C(44)-H(13,14,15,16) bond length is 1.09 Å. In the twenty-ninth C site, C(45,46) is bonded in a trigonal planar geometry to one C(37,38,39); one C(41,42,43); and one C(57,58,59) atom. The C(45,46)-C(57,58,59) bond length is 1.42 Å. In the thirtieth C site, C(47,48) is bonded in a trigonal planar geometry to one C(37,38,39); one C(41,42,43); and one C(57,58,59) atom. The C(47,48)-C(37,38,39) bond length is 1.48 Å. The C(47,48)-C(41,42,43) bond length is 1.39 Å. The C(47,48)-C(57,58,59) bond length is 1.42 Å. In the thirty-first C site, C(49,50,51,52) is bonded in a distorted single-bond geometry to one C(53,54) and one H(17,18,19,20) atom. The C(49,50,51,52)-C(53,54) bond length is 1.39 Å. The C(49,50,51,52)-H(17,18,19,20) bond length is 1.09 Å. In the thirty-second C site, C(53,54) is bonded in a trigonal planar geometry to one C(33,34,35,36); one C(49,50,51,52); and one C(57,58,59) atom. The C(53,54)-C(57,58,59) bond length is 1.42 Å. In the thirty-third C site, C(55,56) is bonded in a trigonal planar geometry to one C(33,34,35,36); one C(49,50,51,52); and one C(57,58,59) atom. The C(55,56)-C(33,34,35,36) bond length is 1.48 Å. The C(55,56)-C(49,50,51,52) bond length is 1.39 Å. The C(55,56)-C(57,58,59) bond length is 1.42 Å. In the thirty-fourth C site, C(57,58,59) is bonded in a trigonal planar geometry to one C(45,46); one C(53,54); and one C(57,58,59) atom. The C(57,58,59)-C(57,58,59) bond length is 1.42 Å. In the thirty-fifth C site, C(60) is bonded in a trigonal planar geometry to one C(47,48); one C(55,56); and one C(57,58,59) atom. The C(60)-C(47,48) bond length is 1.42 Å. The C(60)-C(55,56) bond length is 1.42 Å. The C(60)-C(57,58,59) bond length is 1.42 Å. In the thirty-sixth C site, C(61) is bonded in a trigonal planar geometry to one N(5), one H(21), and one O(25) atom. The C(61)-N(5) bond length is 1.34 Å. The C(61)-H(21) bond length is 1.11 Å. The C(61)-O(25) bond length is 1.25 Å. In the thirty-seventh C site, C(62,63) is bonded in a trigonal planar geometry to one N(6), one H(22), and one O(26) atom. The C(62,63)-N(6) bond length is 1.34 Å. The C(62,63)-H(22) bond length is 1.11 Å. The C(62,63)-O(26) bond length is 1.25 Å. In the thirty-eighth C site, C(64) is bonded in a trigonal planar geometry to one N(7,8); one H(23,24); and one O(28) atom. The C(64)-N(7,8) bond length is 1.34 Å. The C(64)-H(23,24) bond length is 1.11 Å. The C(64)-O(28) bond length is 1.25 Å. In the thirty-ninth C site, C(65,68) is bonded to one N(5); one H(25,26,27,28); one H(29,30,31,32); and one H(33,34,35,36) atom to form corner-sharing CH3N tetrahedra. The C(65,68)-N(5) bond length is 1.46 Å. The C(65,68)-H(25,26,27,28) bond length is 1.10 Å. The C(65,68)-H(29,30,31,32) bond length is 1.10 Å. The C(65,68)-H(33,34,35,36) bond length is 1.10 Å. In the fortieth C site, C(66,67) is bonded to one N(6); one H(25,26,27,28); one H(29,30,31,32); and one H(33,34,35,36) atom to form corner-sharing CH3N tetrahedra. The C(66,67)-N(6) bond length is 1.46 Å. The C(66,67)-H(25,26,27,28) bond length is 1.10 Å. The C(66,67)-H(29,30,31,32) bond length is 1.10 Å. The C(66,67)-H(33,34,35,36) bond length is 1.10 Å. In the forty-first C site, C(69,72) is bonded to one N(5); one H(37,38,39,40); one H(41,42,43,44); and one H(45,46,47,48) atom to form corner-sharing CH3N tetrahedra. The C(69,72)-N(5) bond length is 1.46 Å. The C(69,72)-H(37,38,39,40) bond length is 1.10 Å. The C(69,72)-H(41,42,43,44) bond length is 1.10 Å. The C(69,72)-H(45,46,47,48) bond length is 1.10 Å. In the forty-second C site, C(70,71) is bonded to one N(6); one H(37,38,39,40); one H(41,42,43,44); and one H(45,46,47,48) atom to form corner-sharing CH3N tetrahedra. The C(70,71)-N(6) bond length is 1.46 Å. The C(70,71)-H(37,38,39,40) bond length is 1.10 Å. The C(70,71)-H(41,42,43,44) bond length is 1.10 Å. The C(70,71)-H(45,46,47,48) bond length is 1.10 Å. In the forty-third C site, C(73,74) is bonded in a trigonal planar geometry to one N(9,10); one H(49,50); and one O(29) atom. The C(73,74)-N(9,10) bond length is 1.34 Å. The C(73,74)-H(49,50) bond length is 1.11 Å. The C(73,74)-O(29) bond length is 1.25 Å. In the forty-fourth C site, C(75) is bonded in a trigonal planar geometry to one N(11), one H(51), and one O(31) atom. The C(75)-N(11) bond length is 1.34 Å. The C(75)-H(51) bond length is 1.11 Å. The C(75)-O(31) bond length is 1.25 Å. In the forty-fifth C site, C(76) is bonded in a trigonal planar geometry to one N(12), one H(52), and one O(32) atom. The C(76)-N(12) bond length is 1.34 Å. The C(76)-H(52) bond length is 1.11 Å. The C(76)-O(32) bond length is 1.25 Å. In the forty-sixth C site, C(77,78,79,80) is bonded to one N(9,10); one H(53,54,55,56); one H(57,58,59,60); and one H(61,62,63,64) atom to form corner-sharing CH3N tetrahedra. The C(77,78,79,80)-N(9,10) bond length is 1.45 Å. The C(77,78,79,80)-H(53,54,55,56) bond length is 1.10 Å. The C(77,78,79,80)-H(57,58,59,60) bond length is 1.10 Å. The C(77,78,79,80)-H(61,62,63,64) bond length is 1.10 Å. In the forty-seventh C site, C(81,82,83,84) is bonded to one N(9,10); one H(65,66,67,68); one H(69,70,71,72); and one H(73,74,75,76) atom to form corner-sharing CH3N tetrahedra. The C(81,82,83,84)-N(9,10) bond length is 1.46 Å. The C(81,82,83,84)-H(65,66,67,68) bond length is 1.10 Å. The C(81,82,83,84)-H(69,70,71,72) bond length is 1.10 Å. The C(81,82,83,84)-H(73,74,75,76) bond length is 1.10 Å. There are ten inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(25,26,27,28); one C(33,34,35,36); and one C(37,38,39) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(25,26,27,28); one C(33,34,35,36); and one C(37,38,39) atom. The N(2)-C(25,26,27,28) bond length is 1.44 Å. The N(2)-C(33,34,35,36) bond length is 1.41 Å. The N(2)-C(37,38,39) bond length is 1.41 Å. In the third N site, N(3) is bonded in a trigonal planar geometry to one C(25,26,27,28); one C(33,34,35,36); and one C(37,38,39) atom. The N(3)-C(25,26,27,28) bond length is 1.44 Å. The N(3)-C(33,34,35,36) bond length is 1.41 Å. The N(3)-C(37,38,39) bond length is 1.41 Å. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one C(25,26,27,28); one C(33,34,35,36); and one C(40) atom. The N(4)-C(25,26,27,28) bond length is 1.44 Å. The N(4)-C(33,34,35,36) bond length is 1.41 Å. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one C(61); one C(65,68); and one C(69,72) atom. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one C(62,63); one C(66,67); and one C(70,71) atom. In the seventh N site, N(7,8) is bonded in a trigonal planar geometry to one C(62,63); one C(66,67); and one C(70,71) atom. The N(7,8)-C(62,63) bond length is 1.34 Å. The N(7,8)-C(66,67) bond length is 1.46 Å. The N(7,8)-C(70,71) bond length is 1.46 Å. In the eighth N site, N(9,10) is bonded in a trigonal planar geometry to one C(73,74); one C(77,78,79,80); and one C(81,82,83,84) atom. In the ninth N site, N(11) is bonded in a trigonal planar geometry to one C(75); one C(77,78,79,80); and one C(81,82,83,84) atom. The N(11)-C(77,78,79,80) bond length is 1.45 Å. The N(11)-C(81,82,83,84) bond length is 1.46 Å. In the tenth N site, N(12) is bonded in a trigonal planar geometry to one C(76); one C(77,78,79,80); and one C(81,82,83,84) atom. The N(12)-C(77,78,79,80) bond length is 1.45 Å. The N(12)-C(81,82,83,84) bond length is 1.46 Å. There are twenty-three inequivalent H sites. In the first H site, H(1,2,3,4) is bonded in a single-bond geometry to one C(13) atom. In the second H site, H(5,6,7,8) is bonded in a single-bond geometry to one C(21) atom. In the third H site, H(9,10,11,12) is bonded in a single-bond geometry to one C(29) atom. In the fourth H site, H(13,14,15,16) is bonded in a single-bond geometry to one C(41,42,43) atom. In the fifth H site, H(17,18,19,20) is bonded in a single-bond geometry to one C(49,50,51,52) atom. In the sixth H site, H(21) is bonded in a single-bond geometry to one C(61) atom. In the seventh H site, H(22) is bonded in a single-bond geometry to one C(62,63) atom. In the eighth H site, H(23,24) is bonded in a single-bond geometry to one C(62,63) atom. The H(23,24)-C(62,63) bond length is 1.11 Å. In the ninth H site, H(25,26,27,28) is bonded in a single-bond geometry to one C(65,68) atom. In the tenth H site, H(29,30,31,32) is bonded in a single-bond geometry to one C(65,68) atom. In the eleventh H site, H(33,34,35,36) is bonded in a single-bond geometry to one C(65,68) atom. In the twelfth H site, H(37,38,39,40) is bonded in a single-bond geometry to one C(69,72) atom. In the thirteenth H site, H(41,42,43,44) is bonded in a single-bond geometry to one C(69,72) atom. In the fourteenth H site, H(45,46,47,48) is bonded in a single-bond geometry to one C(69,72) atom. In the fifteenth H site, H(49,50) is bonded in a single-bond geometry to one C(73,74) atom. In the sixteenth H site, H(51) is bonded in a single-bond geometry to one C(75) atom. In the seventeenth H site, H(52) is bonded in a single-bond geometry to one C(76) atom. In the eighteenth H site, H(53,54,55,56) is bonded in a single-bond geometry to one C(77,78,79,80) atom. In the nineteenth H site, H(57,58,59,60) is bonded in a single-bond geometry to one C(77,78,79,80) atom. In the twentieth H site, H(61,62,63,64) is bonded in a single-bond geometry to one C(77,78,79,80) atom. In the twenty-first H site, H(65,66,67,68) is bonded in a single-bond geometry to one C(81,82,83,84) atom. In the twenty-second H site, H(69,70,71,72) is bonded in a single-bond geometry to one C(81,82,83,84) atom. In the twenty-third H site, H(73,74,75,76) is bonded in a single-bond geometry to one C(81,82,83,84) atom. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ca(1); one Ca(2); and one C(1,3) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Ca(2); one Ca(3); and one C(2,4) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Ca(3); one Ca(4); and one C(1,3) atom. The O(3)-C(1,3) bond length is 1.27 Å. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ca(1); one Ca(4); and one C(2,4) atom. The O(4)-C(2,4) bond length is 1.27 Å. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Ca(1) and one C(1,3) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Ca(2) and one C(2,4) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Ca(3) and one C(1,3) atom. The O(7)-C(1,3) bond length is 1.27 Å. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Ca(4) and one C(2,4) atom. The O(8)-C(2,4) bond length is 1.27 Å. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Ca(3); one Ca(4); and one C(5,8) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Ca(1); one Ca(4); and one C(6,7) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Ca(1); one Ca(2); and one C(6,7) atom. The O(11)-C(6,7) bond length is 1.28 Å. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Ca(2); one Ca(3); and one C(5,8) atom. The O(12)-C(5,8) bond length is 1.28 Å. In the thirteenth O site, O(13) is bonded in a distorted water-like geometry to one Ca(4) and one C(5,8) atom. In the fourteenth O site, O(14) is bonded in a distorted water-like geometry to one Ca(1) and one C(6,7) atom. In the fifteenth O site, O(15) is bonded in a distorted water-like geometry to one Ca(2) and one C(6,7) atom. The O(15)-C(6,7) bond length is 1.27 Å. In the sixteenth O site, O(16) is bonded in a distorted water-like geometry to one Ca(3) and one C(5,8) atom. The O(16)-C(5,8) bond length is 1.27 Å. In the seventeenth O site, O(17,18) is bonded in a single-bond geometry to one C(33,34,35,36) atom. In the eighteenth O site, O(19,20) is bonded in a single-bond geometry to one C(33,34,35,36) atom. The O(19,20)-C(33,34,35,36) bond length is 1.23 Å. In the nineteenth O site, O(21,22) is bonded in a single-bond geometry to one C(37,38,39) atom. In the twentieth O site, O(23,24) is bonded in a single-bond geometry to one C(37,38,39) atom. The O(23,24)-C(37,38,39) bond length is 1.23 Å. In the twenty-first O site, O(25) is bonded in a distorted bent 120 degrees geometry to one Ca(1) and one C(61) atom. In the twenty-second O site, O(26) is bonded in a distorted bent 120 degrees geometry to one Ca(2) and one C(62,63) atom. In the twenty-third O site, O(27) is bonded in a distorted bent 120 degrees geometry to one Ca(3) and one C(62,63) atom. The O(27)-C(62,63) bond length is 1.25 Å. In the twenty-fourth O site, O(28) is bonded in a distorted bent 120 degrees geometry to one Ca(4) and one C(64) atom. In the twenty-fifth O site, O(29) is bonded in a distorted bent 120 degrees geometry to one Ca(1) and one C(73,74) atom. In the twenty-sixth O site, O(30) is bonded in a distorted bent 120 degrees geometry to one Ca(2) and one C(73,74) atom. The O(30)-C(73,74) bond length is 1.25 Å. In the twenty-seventh O site, O(31) is bonded in a distorted bent 120 degrees geometry to one Ca(3) and one C(75) atom. In the twenty-eighth O site, O(32) is bonded in a distorted bent 120 degrees geometry to one Ca(4) and one C(76) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)cc(N2C(=O)c3ccc4c5c(ccc(c35)C2=O)C(=O)N(c2cc(C([O])=O)cc(C([O])=O)c2)C4=O)c1. Metal clusters: 8 [Ca]. The MOF has largest included sphere 6.86 A, density 1.18 g/cm3, surface area 4873.63 m2/g, accessible volume 0.40 cm3/g