1. Naturally Occurring Quinones;Thomson,1997
2. For some recent references on biological properties of naphthoquinones see: (a) Wurm, G.; Schwandt, S. Pharmazie1999, 547, 487;
3. (j) Ikushima, H.; Okamoto, M.; Tanaka, H.; Ohe, O.; Kohsaka, M.; Aoki, H.; Imanaka, H. J. Antibiot. 1980, 33, 1107.
4. (b) Wurm, G.; Probst, R.; Bruemmer, U. Sci. Pharm.1998, 66, 279;
5. (c) Lin, T.-S.; Xu, A.-P.; Zhu, L.-Y.; Cosby, L.; Sartonelli, A. J. Med. Chem.1989, 32, 1467;