Chemistry of Heterocyclic Compounds, 2009, vol 45, # 2, p. 248-249.
Synthesis of 7,8-dihydro-6H-pyrazolo[5',1':3,4][1,2,4]-triazino[6,5-d][1,2]diazepin-6-one, a new heterocyclic system
V. V. Didenko, Kh. S. Shikhaliev, I. V. Ledenyova
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http://dx.doi.org/10.1007/s10593-009-0256-0