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Marina V. Goryaeva,* Yanina V. Burgart, Victor I. Saloutin, Elena V. Sadchikova, and Evgeny N. Ulomskii. Synthesis of Fluoroalkylated Dihydroazolo[1,5-a]pyrimidines and Their Ring-Chain Isomerism. Heterocycles. Volume 78, Issue 2, 2009, Pages 435-447
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http://dx.doi.org/10.3987/COM-08-11524