1. G. V. Malinovskaya, A. Ya. Chizhova, V. F. Anufriev, V. P. Glazunov, and V. A. Denisenko,Izv. Akad. Nauk, Ser. Khim., 1999, 1607 [Russ. Chem. Bull., 1999,48, 1587 (Engl. Transl.)].
2. The Chemistry of Quinonoid Compounds, inThe Chemistry of the Functional Groups, Ed. S. Patai, J. Wiley and Sons, New York, 1974, (b) H. Ulrich and R. Richter,Die para-Chinone der Benzol- und Naphthalin-Reihe, inMethoden der Organischen Chemie, Ed. I. Houben and T. Weyl, Georg Thieme Verlag, Stuttgart, 1977, Bd. 7/3a.
3. Yu. B. Shvetsov and M. M. Shemyakin,Zh. Obshch. Khim., 1949,19, 480 [J. Gen. Chem. USSR, 1949, 19 (Engl. Transl.)].
4. (a) K. Wallenfels and A. Gauhe,Ber., 1942,75B, 413; (b) R. Kuhn and K. Wallenfels,Ber., 1942,75B, 407.
5. L. S. Stepanenko, O. E. Krivoshchekova, P. S. Dmitrenok, and O. B. Maximov,Phytochemistry, 1997,46, 565.