Dapholidins A – C, New Isomeric Biisoflavonoids From Daphne oleoides

Three new isomeric biisoflavonoids, dapholidins A–C ( 1 – 3 , resp.), have been isolated from the AcOEt‐soluble fraction of the MeOH‐soluble extract of the roots of Daphne oleoides , along with the known compounds daphwazirin ( 4 ), daphnetin 8‐ O ‐ β ‐ D ‐glucopyranoside ( 5 ), daphnin ( 6 ), daphneticin 4″‐ O ‐ β ‐ D ‐glucopyranoside ( 7 ), and 6,7‐dihydroxy‐3‐methoxy‐8‐[2‐oxo‐2 H ‐1‐benzopyran‐7‐( O ‐ β ‐ D ‐glucopyranosyl)‐8‐yl]‐2 H ‐1‐benzopyran‐2‐one ( 8 ). The structures of the new compounds were determined by spectroscopic analyses, including 1D‐ and 2D‐NMR.