参考文献
Andreichikov, Yu. S.; Nekrasov, D. D.; Rudenko, M. A.; Konovalov, A. Yu.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1987 , vol. 23, # 6 p. 610 - 613
Khimiya Geterotsiklicheskikh Soedinenii, 1987 , vol. 23, # 6 p. 740 - 743