Hj. Woerdenbag et al., ISOLATION OF 2 CYTOTOXIC DITERPENES FROM THE FERN PTERIS-MULTIFIDA, Zeitschrift fur Naturforschung. C, A journal of biosciences, 51(9-10), 1996, pp. 635-638
From aerial parts of the fern Pteris multifida Poir. (Polypodiaceae) t
wo diterpenes, ent-kaurane-2 beta,16 alpha-diol and ent-kaur-16-ene-2
beta,15 alpha-diol, were isolated by repeated column chromatography us
ing silica gel and silica gel impregnated with silver nitrate. The str
uctures were confirmed by spectroscopic methods. Both compounds showed
a moderate cytotoxicity to Ehrlich ascites tumour cells.