Steroidal saponins from the bulbs of Allium chinense

Two new steroidal saponins, chinenoside VI (1) and neomacrostemonoside D (8b), together with ten known saponins were isolated from the bulbs of Allium chinense. On the basis of chemical evidence and spectral analysis (IR, H-1-NMR C-13-NMR H-1-H-1 COSY, HMQC, HMBC and SI-MS), chinenoside VI was established as (25R)-24-O-beta-D-glucopyranosyl-3 beta,24 beta-dihydroxy-5 alpha-spirost 3-O-alpha-arabinopyranosyl-(1-->6)-beta-D-glucopyranoside, and neomacrostemonoside D was elucidated as neotigogenin 3-O-beta-D-glucopyranosyl-(1-->2)[beta-D-glucopyranosyl-(1-->3)]-(6-acetyl-beta-D-glucopyranosyl)-(1-->4)-beta-D-galactopyranoside, respectively.