New Diarylheptanoids from Alnus japonica and Their Antioxidative Activity. -Diarylheptanoids (I) are isolated from the leaves of Alnus japonica. The main constituent is oregonin (Ic). It is shown that compounds having a catechol structure possess antioxidative activities. -(KUROYANAGI*, M.; SHIMOMAE, M.; NAGASHIMA, Y.; MUTO, N.; OKUDA, T.; KAWAHARA, N.; NAKANE, T.; SANO, T.; Chem.
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