参考文献
Bulychev, Yu. N.; Preobrazhenskaya, M. N.; Chernyshev, A. I.; Esipov, S. E.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1988 , vol. 24, p. 751 - 755
Khimiya Geterotsiklicheskikh Soedinenii, 1988 , vol. 24, # 7 p. 914 - 919