Argymekosides A‐C, Three Undescribed 21α‐Hydroxyoleanolic Acid Glycosides From Argyreia mekongensis and Their Cytotoxic Activity
ABSTRACT Three previously undescribed 21α‐hydroxyoleanolic acid glycosides, designated Argymekosides A–C (1–3), together with eight known compounds (4–11), were isolated from the aerial parts of Argyreia mekongensis Gagnep. & Courchet. Their structures were elucidated by comprehensive spectroscopic analyses, including...