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Fructus crataegi (hawthorn) is the common name of all plant species in the genus Crataegus of the Rosaceae family.In the present study, three monomers of (+)-catechin (C), (-)-epicatechin gallate (ECg) and (-)-epigallocatechin (EGC) were isolated from the hawthom under the guide of antibacterial sensitization activity.