Abstract
The reinvestigation of Microlepia marginata (PANZER) C. CHR. afforded in addition to the previously reported ent-kaurane glycosides three new ent-pimarene derivatives, which were named fumotoshidin A (I), B (II) und C (III). The structures of the new compounds were characterized by spectroscopic methods and some chemical transformations as 2β, 15 (R), 16-trihydroxy-entpimar-7-en-3-one (1), 3α, 15 (R), 16-trihydroxy-ent-pimar-7-en-2-one (II) and 2, 15 (R), 16-trihydroxy-ent-pimar-1, 7-dien-3-one (III).