Ryakhovskaya, M. I.; Popova, E. V.; Grinenko, G. S.; Terekhina, A. I.; Gritsina, G. I.; et al. Pharmaceutical Chemistry Journal, 1990 , vol. 24, # 3 p. 184 - 189 Khimiko-Farmatsevticheskii Zhurnal, 1990 , vol. 24, # 3 p. 26 - 29