Abstract
Four novel saponins, astraisoolesaponins A1–A3 and B (1–4) were isolated from the stems of Astragalus membranaceus (Fisch.) Bge. var. mongholicus (Bge.) Hsiao. Spectroscopic analysis indicated that 1–4 are the first example of saponins possessing a 28-methyl-rearranged carbon skeleton. Their absolute configurations were determined by electronic circular dichroism (ECD) calculations. Both 3 and 4 displayed triglyceride accumulation inhibitory effects in HepG2 cells and glucose uptake increase effects on L6 cells.
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