参考文献
Krauze, A. A.; Liepin'sh, E. E.; Kalme, Z. A.; Pelcher, Yu. E.; Dubur, G. Ya.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. 20, # 11 p. 1241 - 1245
Khimiya Geterotsiklicheskikh Soedinenii, 1984 , # 11 p. 1504 - 1508