Sepulchrate

1,3,6,8,10,13,16,19-Octaazabicyclo[6.6.6]icosane

3,10-(2,5-Diazahexane-1,6-diyl)-1,3,5,8,10,12-hexaazacyclotetradecane

3,10-[Ethylenebis(iminomethylene)]-1,3,5,8,10,12-hexaazacyclotetradecane