参考文献
Bakulev, V. A.; Dankova, E. F.; Mokrushin, V. S.; Sidorov, E. O.; Lebedev, A. T.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1987 , vol. 23, # 6 p. 698 - 701
Khimiya Geterotsiklicheskikh Soedinenii, 1987 , vol. 23, # 6 p. 845 - 849