1. Yunusov, M.S., Tsyrlina, E.M., Khairitdinova, E.D., Spirikhin, L.V., Kovalevskii, A.Yu., and Antipin, M.Yu., Izv. Ross. Akad. Nauk, Ser. Khim., 2000, p. 1640.
2. Hanuman, J.B. and Katz, A., J. Nat. Prod., 1994, vol. 57, p. 1473.
3. Yunusov, M.S., Rashkes, Ya.V., Salimov, B.T., Ametova, E.F., and Fridlyanskii, G.V., Khim. Prirodn. Soedin., 1985, p. 525.
4. Derome, A.E., Modern NMR Techniques for Chemistry Research, Oxford: Pergamon, 1988, p. 280; Atta-ur-Rahman, One and Two Dimensional NMR Spectroscopy, Amsterdam: Elsevier, 1989, p. 579.
5. De Dios, A., Prog. Nucl. Magn. Reson. Spectrosc., 1996, vol. 29, p. 229; Barone, G., Gomez-Paloma, L., Duca, D., Silvestri, A., Riccio, R., and Bifulco, G., Chem. Eur. J., 2002, vol. 8, p. 3233; Alkorta, I. and Elguero, J., Magn. Reson. Chem., 2004, vol. 42, p. 955.