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Khimiya Geterotsiklicheskikh Soedinenii, , vol. 20, # 10 p. 1359 - 1361
potassium hydroxide in dimethyl sulfoxide T=80 - 120°C;
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Korostova, S. E.; Shevchenko, S. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1990 , vol. 26, # 12 p. 1412
Khimiya Geterotsiklicheskikh Soedinenii, 1990 , # 12 p. 1695 - 1696