1. Parker, H. I., Blaschke, G. & Rapoport, H. Am. Chem. Soc. 94, 1276–1282 (1972).
2. Brochmann-Hanssen, E. Planta Medica 50, 343–345 (1984).
3. Kutchan, T. M. Gene 179, 73–81 (1996).
4. Zenk, M. H. in Organic Reactivity: Physical and Biological Aspects (eds Maskill, H., Golding, B. T. & Griffin, R. J.) 89–109 (Royal Society of Chemistry, Cambridge, UK, 1995).
5. Kutchan, T. M., Frick, S. & Weid, M. in Advances in Plant Biochemistry and Molecular Biology (eds Bohnert, H. J. & Nguyen, H. T.) (Elsevier Science, Oxford, in the press).