Two approaches to a new heterocyclic system of pyrazolo[4,3-e][1,2,4]triazolo[1,5-c]pyrimidine von Mezheritsky, Valery V., Minkin, Vladimir I., Minyarva, Lyudmila G., Tyurin, Roman V., Krasnikov, Valery V., Vorobyev, Eugeny V., Starikova, Zoya A.

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