参考文献
Gaponik, P. N.; Karavai, V. P.; Davshko, I. E.; Degtyarik, M. M.; Bogatikov, A. N.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1990 , vol. 26, # 11 p. 1274 - 1278
Khimiya Geterotsiklicheskikh Soedinenii, 1990 , # 11 p. 1528 - 1532