Content : minimum 3.0 per cent of tannins, expressed as pyrogallol (C 6 H 6 O 3 ;M r 126.1) (dried drug).

• 本品（以干燥品计）所含鞣质以焦性没食子酸计（C 6 H 6 O 3 ）不得少于3.；0%25。