1. Horiguchi, M. & Kandatsu, M. Nature 184, 901–902 (1959).
2. Hori, T., Horiguchi, M. & Hayashi, A. Biochemistry of Natural C—P Compounds (Maruzen, Tokyo, 1984).
3. Mastalerz, P. in Natural Products Chemistry (eds Zalewski, R. I. & Skolik, J. J.) 171–184 (Elsevier, Amsterdam, 1984).
4. Thompson, S. N. & Lee, R. W. K. J. Parasit. 71, 652–663 (1985).
5. Seto, H. et al. J. Antibiot. 35, 1719–1721 (1982).