Sandoz Pharm. Corp.
Patent: US4670600 A1, 1987 ;

Tertov, B. A.; Onishchenko, P. P.; Koshchienko, Yu. V.; Suvorova, G. M.; Malysheva, E. N.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1982 , vol. 18, # 8 p. 823 - 826
Khimiya Geterotsiklicheskikh Soedinenii, 1982 , vol. 18, # 8 p. 1078 - 1081

Tertov, B. A.; Onishchenko, P. P.; Koshchienko, Yu. V.; Suvorova, G. M.; Malysheva, E. N.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1982 , vol. 18, # 8 p. 823 - 826
Khimiya Geterotsiklicheskikh Soedinenii, 1982 , vol. 18, # 8 p. 1078 - 1081