Isolation and identification of two new flavanones and a chalcone from Citrus kinokuni

Abstract

Two new flavanones and one chalcone were isolated from the peel of Citrus kinokuni Hort. ex Tanaka and identified as (2S)-5,6,7,8,4′-pentamethoxyflavanone (1), (2S)-5,6,7,3′,4′-pentamethoxyflavanone (2) and 2′-hydroxy-3,4,3′,4′,6′-pentamethoxychalcone (3). The structures of new compounds were elucidated by spectroscopic analysis.