Abstract: For the research of the chemical components of the fruit of Crataegus pinnatifida, a new compound has been isolated from the ethanol extracts (extracted by 75% ethanol) of this sample by using various chromatographic techniques. Its structure was identified by spectral methods, and was named as 2′-hydroxy-7-(3-hydroxypropyl)-6-methoxy-flavone. The biological activity test showed that this compound exhibited certain antibacterial activity with MIC₉₀ value of 34.8 ± 3 μg/mL for methicillin resistant Staphylococcus aureus (MRSA) strain.

Key words: Crataegus pinnatifida, flavone, antibacterial activity