It contains not less than 1.5 per cent of flavonoids, calculated as hyperoside (C 21 H 20 O 12 ;M r 464.4) with reference to the dried drug.

• 本品（以干燥品计）所含黄酮类成分以金丝桃苷（C 21 H 20 O 12 ）计，不得少于1.；5%25。