(Z,Z)-1,5,8,12-Tetraazatricyclo(10.4.4.2(sup 5,8))docosa-14,18-diene-13,16,17,20-tetrone 1,5,8,12-Tetraazatricyclo(10.4.4.2(sup 5,8))docosa-14,18-diene-13,16,17,20-tetrone, (Z,Z)- 39756-43-9