Object A systematic study on the chemical constituents of Citrus changshan huyou Y B Chang was carried out in order to reveal the active components for their further development Methods By repeated silica gel chromatographic separation and spectral analysis the structures were determined Results Six compounds of the flavonoids were obtained and identified They were hesperidin (hysperetin 7 O rutonoside) (Ⅰ); naringenin (Ⅱ); nobiletin (3′, 4′, 5, 6, 7, 8 hexamethoxyflavone) (Ⅲ); tangertin (4′, 5, 6, 7, 8 pentamethoxyflavone) (Ⅳ); 5 hydroxy 3′, 4′, 6, 7, 8 pentamethoxyflavone (Ⅴ); 5 hydroxy 3′, 4′, 6, 7, 8 haxamethoxyflavone (Ⅵ) Conclusion The above six compounds were obtained from this plant for the first time
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