Isoflavonoid Glycosides from the Rhizomes of Iris germanica

Five new di‐ and triglycosides, irigenin 7‐[O‐β‐D‐glucopyranosyl‐(1→6)‐β‐D‐glucopyranoside] (1), 6‐hydroxygenistein 4′‐[O‐β‐D‐glucopyranosyl‐(1→6)‐β‐D‐glucopyranoside] (2), nigricin 4′‐[O‐β‐D‐glucopyanosyl‐(1→6)‐β‐D‐glucopyranoside] (3), nigricin 4′‐[O‐β‐D‐glucopyanosyl‐(1→2)‐O‐[α‐L‐rhamnopyranosyl‐(1→6)]‐β‐D‐glucopyranoside] (4), and 7‐{4′‐{[2″‐O‐(4′′′′‐acetyl‐2′′′′‐methoxyphenyl)‐β‐D‐glucopyranosyl]oxy}‐3′‐(β‐D‐glucopyranosyloxy)phenyl]‐9‐methoxy‐8H‐1,3‐dioxolo[4,5‐g]‐[1 benzopyran‐8‐one‐] (5), along with a known compound, nigricin 4′‐(β‐D‐glucopyranoside) (6), were isolated from the rhizomes of Iris germanica. The structures of these compounds were established by spectroscopic methods, including 2D NMR spectroscopic techniques.