参考文献
Ubatullin, U. G.; Petrushina, T. F.; Popov, Yu. N.; Gataullin, R. R.; Safarov, M. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1987 , vol. 23, # 4 p. 375 - 376
Khimiya Geterotsiklicheskikh Soedinenii, 1987 , # 4 p. 449 - 450