参考文献

Porotikova,V.A. et al. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1970 , vol. 6, p. 1011 - 1013 Khimiya Geterotsiklicheskikh Soedinenii, 1970 , vol. 6, # 8 p. 1083 - 1085