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Seven hexahydrobenzophenanthridine-type alkaloids, Ambiguanine A–G, along with eight known alkaloids, were isolated from tubers of Corydalis ambigua var. amurensis. Their structures were elucidated based on extensive spectroscopic analyses, with absolute configurations determined by CD experiments.
Six cardenolides were isolated from the anti-tumor active fraction of the 75% ethanol extract of Streptocaulon juventas (Asclepiadaceae), mainly found in southwest of China. These were named 1α, 14β-dihydroxy-5β-card-20 (22)-enolide 3-O-[O-β-d-glucopyranosyl-(1→2)-β-d-digitalopyranoside] (1), acovenosigenin A 3-O-[O-β-d-glucopyranosyl-(1→4)-β-d-digitalopyranoside] (2), 16-O-acetyl-hydroxyperiplogenin...
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