Beside the known naphthoquinones, dehydro-α-lapachone (17) and lapachol (20), four new naphtho[2,3-b]-furan-4,9-diones, i.e. the 2-acetyl-5-hydroxy. 2-acetyl-8-hydroxy. (−)-5-hydroxy-2-(1′-hydroxyethyl), and (±)-8-hydroxy-2-(1′-hydroxyethyl) derivatives 16, 15, 12,...
five unusually prenylated naphthoquinones and one anthraquinone were newly isolated along with both dunnione and 1-hydroxy-2-hydroxymethylanthraquinone, which had already been found in this plant. Furthermore, the structures of four new naphthoquinones, dehydrodunnione, streptocarpone, 7-hydroxydunnione...