Cu3C21N12H18O crystallizes in the cubic I-43m space group. Cu(1) is bonded in a rectangular see-saw-like geometry to one N(2), two equivalent N(1), and one O(1) atom. The Cu(1)-N(2) bond length is 2.01 Å. Both Cu(1)-N(1) bond lengths are 1.99 Å. The Cu(1)-O(1) bond length is 2.00 Å. There are six inequivalent C sites. In the first C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(6), one N(2), and one H(2) atom. The C(2)-C(6) bond length is 1.37 Å. The C(2)-N(2) bond length is 1.34 Å. The C(2)-H(2) bond length is 0.93 Å. In the second C site, C(3) is bonded in a distorted bent 120 degrees geometry to one N(2) and one H(3) atom. The C(3)-N(2) bond length is 1.34 Å. The C(3)-H(3) bond length is 0.93 Å. In the third C site, C(4) is bonded in a distorted single-bond geometry to one C(5) and one H(4) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-H(4) bond length is 0.93 Å. In the fourth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one H(5) atom. The C(5)-C(6) bond length is 1.33 Å. The C(5)-H(5) bond length is 0.93 Å. In the fifth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(2), one C(5), and one N(3) atom. The C(6)-N(3) bond length is 1.46 Å. In the sixth C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(1) atom. The C(1)-N(1) bond length is 1.28 Å. The C(1)-N(3) bond length is 1.35 Å. The C(1)-H(1) bond length is 0.93 Å. There are three inequivalent N sites. In the first N site, N(2) is bonded in a trigonal planar geometry to one Cu(1), one C(2), and one C(3) atom. In the second N site, N(3) is bonded in a trigonal planar geometry to one C(6) and two equivalent C(1) atoms. In the third N site, N(1) is bonded in a 2-coordinate geometry to one Cu(1) and one C(1) atom. There are five inequivalent H sites. In the first H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(3) is bonded in a single-bond geometry to one C(3) atom. In the third H site, H(4) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(5) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(1) is bonded in a single-bond geometry to one C(1) atom. O(1) is bonded in a trigonal non-coplanar geometry to three equivalent Cu(1) atoms. Linkers: 24 c1cncc(-n2cnnc2)c1. Metal clusters: 8 N1=N[Cu]2=NN=[Cu](N=N[Cu]1)O2. The MOF has largest included sphere 11.63 A, density 0.91 g/cm3, surface area 3930.71 m2/g, accessible volume 0.76 cm3/g