Microbial transformation of 20(S)-protopanaxadiol by Absidia corymbifera. Cytotoxic activity of the metabolites against human prostate cancer cells

► Two new and three known metabolites of 20(S)-protopanaxadiol were obtained. ► The 7β hydroxylation of derivatives of 20(S)-protopanaxadiol ► The specific C-7 dehydrogenation of derivatives of 20(S)-protopanaxadiol ► Cytotoxic activity of the metabolites against human prostate cancer cells