Vol. 9 -I987 Pharmaceutisch Weekblad Scienttfic Edition officinale L. species complex and S. asperum Lepech. Part n. Phytosterols and triterpe.noids. Plant Syst Evol z983;I43:285-92. Wichers H J, Ten Kate J, Buys CHCM, Huizing HJ. A simple and rapid procedure to obtain nucleated proto-z87 plasts from plant material. Cytologia I984;49: xo3-9. Huizing H J, R6der E, Wiedenfeld H. Die '~C-NMR-Daten des Pyrrolizidine-Alkaloids Echimidin. Arch Pharm (Weinheim) *985;3*8:476-7. clinical pharmacological meeting Organized by the