1. Orekhov, A.P., Khimiya alkaloidov (Alkaloids Chemistry), Moscow: Izd. Akademii nauk, 1955, p. 237.
2. Ferlin, M.G., Marzano, C., Chiarelotto, G., Baccichetti, F., and Bordin, F., Eur. J. Med. Chem., 2000, vol. 35, p. 827.
3. Adamczyk, M., Fishpaugh, J., and Mattingly, P., Bioorg. Med. Chem. Lett., 1999, vol. 9, p. 217; Ref. Zh. Khim., 2001, 5O260.
4. Kozlov, N.G., Basalaeva, L.I., and Dikusar, E.A., Khim. Polim. Soed., 2004, vol. 40, p. 79.
5. Kozlov, N.G., Gusak, K.N., Tereshko, A.B., and Dikusar, E.A., Zh. Org. Khim., 2004, vol. 39, p. 738.