Co3C28N4H21O9 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one N(1), one O(2), one O(3), one O(4), and one O(5) atom to form CoNO4 square pyramids that share  a cornercorner with one Co(2)N2O3 square pyramid and  a cornercorner with one Co(1)NO4 square pyramid. The Co(1)-N(1) bond length is 2.19 Å. The Co(1)-O(2) bond length is 2.05 Å. The Co(1)-O(3) bond length is 2.05 Å. The Co(1)-O(4) bond length is 2.06 Å. The Co(1)-O(5) bond length is 2.11 Å. In the second Co site, Co(2) is bonded to one N(2), one N(3), one O(5), and two equivalent O(1) atoms to form corner-sharing CoN2O3 square pyramids. The Co(2)-N(2) bond length is 2.14 Å. The Co(2)-N(3) bond length is 2.22 Å. The Co(2)-O(5) bond length is 2.11 Å. Both Co(2)-O(1) bond lengths are 2.08 Å. There are sixteen inequivalent C sites. In the first C site, C(13) is bonded in a trigonal planar geometry to one C(14) and two equivalent C(8) atoms. The C(13)-C(14) bond length is 1.52 Å. Both C(13)-C(8) bond lengths are 1.36 Å. In the second C site, C(14) is bonded in a bent 120 degrees geometry to one C(13) and two equivalent O(3) atoms. Both C(14)-O(3) bond lengths are 1.23 Å. In the third C site, C(15) is bonded in a 5-coordinate geometry to one C(16), two equivalent C(10), and two equivalent C(12) atoms. The C(15)-C(16) bond length is 1.53 Å. Both C(15)-C(10) bond lengths are 1.37 Å. Both C(15)-C(12) bond lengths are 1.39 Å. In the fourth C site, C(16) is bonded in a distorted trigonal planar geometry to one C(15) and two equivalent O(4) atoms. Both C(16)-O(4) bond lengths are 1.21 Å. In the fifth C site, C(1) is bonded in a 3-coordinate geometry to one C(2), one N(1), and one H(1) atom. The C(1)-C(2) bond length is 1.37 Å. The C(1)-N(1) bond length is 1.37 Å. The C(1)-H(1) bond length is 0.95 Å. In the sixth C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(2) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-H(2) bond length is 0.95 Å. In the seventh C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(6) atom. The C(3)-C(4) bond length is 1.38 Å. The C(3)-C(6) bond length is 1.50 Å. In the eighth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(3) atom. The C(4)-C(5) bond length is 1.38 Å. The C(4)-H(3) bond length is 0.95 Å. In the ninth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one N(1), and one H(4) atom. The C(5)-N(1) bond length is 1.31 Å. The C(5)-H(4) bond length is 0.95 Å. In the tenth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(6)-O(1) bond length is 1.26 Å. The C(6)-O(2) bond length is 1.25 Å. In the eleventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(8), one N(2), and one H(5) atom. The C(7)-C(8) bond length is 1.40 Å. The C(7)-N(2) bond length is 1.33 Å. The C(7)-H(5) bond length is 0.95 Å. In the twelfth C site, C(8) is bonded in a distorted trigonal planar geometry to one C(13), one C(7), and one H(6) atom. The C(8)-H(6) bond length is 0.95 Å. In the thirteenth C site, C(9) is bonded in a 2-coordinate geometry to one C(10), one N(3), and one H(7) atom. The C(9)-C(10) bond length is 1.36 Å. The C(9)-N(3) bond length is 1.34 Å. The C(9)-H(7) bond length is 0.95 Å. In the fourteenth C site, C(10) is bonded in a 4-coordinate geometry to one C(12), one C(15), one C(9), and one H(8) atom. The C(10)-C(12) bond length is 1.24 Å. The C(10)-H(8) bond length is 0.95 Å. In the fifteenth C site, C(11) is bonded in a 2-coordinate geometry to one C(12), one N(3), and one H(9) atom. The C(11)-C(12) bond length is 1.39 Å. The C(11)-N(3) bond length is 1.34 Å. The C(11)-H(9) bond length is 0.95 Å. In the sixteenth C site, C(12) is bonded in a 4-coordinate geometry to one C(10), one C(11), one C(15), and one H(10) atom. The C(12)-H(10) bond length is 0.95 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Co(1), one C(1), and one C(5) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Co(2) and two equivalent C(7) atoms. In the third N site, N(3) is bonded in a 5-coordinate geometry to one Co(2), two equivalent C(11), and two equivalent C(9) atoms. There are eleven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(7) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(8) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(9) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(10) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(11) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(12) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one O(5) atom. The H(11)-O(5) bond length is 0.80 Å. There are five inequivalent O sites. In the first O site, O(5) is bonded in a single-bond geometry to one Co(2), two equivalent Co(1), and one H(11) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Co(2) and one C(6) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one C(6) atom. In the fourth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one C(14) atom. In the fifth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one C(16) atom. Linkers: 12 [O]C(=O)c1ccncc1 ,2 [C@@H]12[C@@H]3[C@@]42[C@@H]2[C@H]4[C@@H]4[N@@]5([C@H]1[C@H]35)[C@H]24.[O][C]=O ,1 [C@@H]12[C@@H]3[C@@]42[C@H]2[C@@H]4[C@H]4[N@@]5([C@H]1[C@H]35)[C@@H]24.[O][C]=O ,1 [C@@H]12[C@@H]3[C@@]42[C@H]2[C@@H]4[C@H]4[N@]5([C@H]1[C@H]35)[C@@H]24.[O][C]=O. Metal clusters: 4 O[Co]1O[C]O[Co]2O[C]O[Co](O[C]O1)O[C]O2. The MOF has largest included sphere 6.08 A, density 1.08 g/cm3, surface area 3518.05 m2/g, accessible volume 0.48 cm3/g