1. a) R. H. Thomson, Naturally Occurring Quinones, 2nd Ed., Academic Press, London, New York, 1971; b) 3rd Ed., Chapman & Hall, London, New York, 1987.
2. M. Service and A. C. Wardlaw, Comp. Biochem. Physiol., 79, 161 (1984);
3. G. Br. Pat. 2,159,056; Chem. Abstr., 104, 83795 (1986);
4. V. P. Anufriev, V. L. Novikov, O. B. Maximov, G. B. Elyakov, D. O. Levitsky, A. V. Lebedev, S. M. Sadretdinov, A. V. Shvilkin, N. I. Afonskaya, M. Ya. Ruda, and N. M. Cherpachenko, Bioorg. Med. Chem. Lett., 8, 587 (1998).
5. a) G. B. Elyakov, O. B. Maksimov, et al., RF Pat. No. 2,137,472; Byull. Izobret., 26, Chem. Abstr., 132, 284239b (1999); b) G. B. Elyakov, O. B. Maksimov, et al., RF Pat. No. 2,134,107; Byull. Izobret., 22 (1999).