Three New Chalcones from the Aerial Parts of Angelica keiskei

Three new chalcones, 3′‐carboxymethyl‐4,2′‐dihydroxy‐4′‐methoxychalcone ( 1 ), (±)‐4,2′,4′‐trihydroxy‐3′‐(3‐hydroxy‐2,2‐dimethyl‐6‐methylenecyclohexyl)methyl]chalcone ( 2 ), and 2′′‐hydroxyangelichalcone ( 3 ), were isolated from the aerial parts of Angelica keiskei (Umbelliferae) together with five known compounds, artocarmitin A ( 4 ), (+)‐cis‐(3′R,4′R)‐methylkhellactone ( 5 ), (?)‐trans‐(3′R,4′S)‐methylkhellactone ( 6 ), 3,4‐dihydroxanthotoxin ( 7 ), and (Z)‐p‐coumaryl alcohol ( 8 ). The known compounds 4  –  8 were identified from A. keiskei for the first time. The structures of 1  –  3 were elucidated by interpreting spectroscopic data including 1D‐ and 2D‐NMR.