1. For reviews on 1,2,4-triazepines, see:
2. Seven-membered rings with two or more heteroatoms;Sharp,1984
3. Seven-membered rings with three heteroatoms 1,2,4;Tsuchiya,1996
4. Seven-membered rings with three heteroatoms 1,2,4;Yranzo,2008
5. Monocyclic and Condensed Triazepines and Tetrazepines;Peet,1984