American Cyanamid Company
Patent: US4393217 A1, 1983 ;

Granik, V. G.; Grizik, S. I.; Ershov, L. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 12 p. 1341
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 12 p. 1691

Granik, V. G.; Grizik, S. I.; Ershov, L. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 12 p. 1341
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 12 p. 1691