CoC6N5H4O2CH3 crystallizes in the tetragonal I4_1/a space group. The structure consists of sixteen 02329_fluka molecules inside a CoC6N5H4O2 framework. In the CoC6N5H4O2 framework, Co(1) is bonded in a square pyramidal geometry to one N(1), one N(2), one N(4), one O(1), and one O(2) atom. The Co(1)-N(1) bond length is 2.08 Å. The Co(1)-N(2) bond length is 2.05 Å. The Co(1)-N(4) bond length is 2.13 Å. The Co(1)-O(1) bond length is 2.06 Å. The Co(1)-O(2) bond length is 2.05 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(4), and one H(1) atom. The C(1)-N(1) bond length is 1.36 Å. The C(1)-N(4) bond length is 1.35 Å. The C(1)-H(1) bond length is 1.08 Å. In the second C site, C(5) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one N(4) atom. The C(5)-C(2) bond length is 1.41 Å. The C(5)-C(4) bond length is 1.42 Å. The C(5)-N(4) bond length is 1.39 Å. In the third C site, C(2) is bonded in a distorted trigonal planar geometry to one C(5), one N(1), and one N(2) atom. The C(2)-N(1) bond length is 1.36 Å. The C(2)-N(2) bond length is 1.35 Å. In the fourth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(6)-O(1) bond length is 1.28 Å. The C(6)-O(2) bond length is 1.27 Å. In the fifth C site, C(3) is bonded in a trigonal planar geometry to one N(2), one N(3), and one H(2) atom. The C(3)-N(2) bond length is 1.35 Å. The C(3)-N(3) bond length is 1.33 Å. The C(3)-H(2) bond length is 1.09 Å. In the sixth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(5), one N(3), and one N(5) atom. The C(4)-N(3) bond length is 1.36 Å. The C(4)-N(5) bond length is 1.35 Å. There are five inequivalent N sites. In the first N site, N(2) is bonded in a trigonal planar geometry to one Co(1), one C(2), and one C(3) atom. In the second N site, N(3) is bonded in a bent 120 degrees geometry to one C(3) and one C(4) atom. In the third N site, N(4) is bonded in a distorted trigonal planar geometry to one Co(1), one C(1), and one C(5) atom. In the fourth N site, N(1) is bonded in a trigonal planar geometry to one Co(1), one C(1), and one C(2) atom. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one C(4), one H(3), and one H(4) atom. The N(5)-H(3) bond length is 1.01 Å. The N(5)-H(4) bond length is 1.03 Å. There are four inequivalent H sites. In the first H site, H(3) is bonded in a single-bond geometry to one N(5) atom. In the second H site, H(4) is bonded in a single-bond geometry to one N(5) atom. In the third H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the fourth H site, H(2) is bonded in a single-bond geometry to one C(3) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one C(6) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Co(1) and one C(6) atom. Linkers: 2 NC1=NC=[N]=C2C1=NC=N2 ,4 NC1=NC=[N]=C2[C]1N=C[N]2 ,1 Nc1ncnc2c1N=C[N]2 ,1 Nc1ncnc2=[N]=CN=c12. Metal clusters: 4 C[C]1O[Co]2=[Co](O1)O[C](C)O2. The MOF has largest included sphere 4.92 A, density 1.32 g/cm3, surface area 3652.81 m2/g, accessible volume 0.36 cm3/g