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Different hydrolytic degree of “a” into “b” and “c” (proved to be corilagin and brevifolin carboxylic acid, respectively) with different extraction conditions: (A) Reflux with 50% methanol for 30 min; (B) Reflux with 10% methanol for 30 min; (C) Reflux with water for 30 min; (D) Reflux with water for 60 min; (E) Reflux with water for 90 min.
