Abstract
AbstractThree new saponins 1–3 were isolated from Herniaria glabra by means of prep. HPLC and TLC. The structures were established mainly by a combination of 2D‐NMR techniques (COSY, TOCSY, ROESY, HMQC, and HMBC) as O‐α‐L‐rhamnopyranosyl‐(1→4)‐O‐β‐D‐glucopyranosyl‐(1‐→6)‐O‐[β‐D‐glucopyranosyl‐(1→2)]‐β‐D‐glucopyranosyl medicagen‐28‐ate (herniaria saponin 4; 1), O‐β‐D‐glucopyranosyl‐(1→3)‐O‐α‐L‐rhamnopyranosyl‐(1→2)‐O‐[β‐(3R)‐D‐apiofuranosyl‐(1→3)]‐β‐D‐4‐O‐acetylfucopyranosyl 3‐O‐(β‐D‐glucuronopyranosyl)‐16α‐hydroxymedicagen‐28‐ate (herniaria saponin 5; 2), and O‐α‐L‐rhamnopyranosyl‐(1→4)‐O‐β‐D‐glucopyranosyl‐(1→6)‐O‐[β‐D‐6‐O‐acetylglucopyra nosyl‐(1→2)]‐β‐D‐glucopyranosyl medicagen‐28‐ate (herniaria saponin 6; 3).
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