参考文献
Shafran, Yu. M.; Bakulev, V. A.; Mokrushin, V. S.; Alekseev, S. G.; Lebedev, A. T.; Sharbatyan, P. A.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1986 , vol. 22, # 7 p. 740 - 745
Khimiya Geterotsiklicheskikh Soedinenii, 1986 , vol. 22, # 7 p. 926 - 931