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A new furostanol saponin, named hypoglaucin F, was isolated from the rhizomes of Dioscorea collettii var. hypoglauca, along with seven known compounds. On the basis of detailed chemical and spectroscopic evidence, the structure of hypoglaucin F was determined as (25S)-26-O-β-glucopyranosyl 22-hydroxy-5-en-furostane-3β, 26, 27-triol 3-O-α-l-rhamnopyranosyl-(1 → 2)-[α-l-rhamnopyranosyl-(1 → 4)]-β-d-glucopyranoside.
An ethyl acetate-soluble root extract of Angelica pubescence f. biserrata afforded two new angelol-type coumarins, angelols K and L, in addition to angelols B, C, D and G. Some of the compounds were tested on human platelet aggregation and showed significant activity.
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