Quassin
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Quassin is a white bitter, crystaline substance extracted from the quassia tree. It is used as a medicine in traditional Chinese medicine. Extracts of the Bitter tree are also used as additives in soft drinks.
Quassin is a diterpene lactone. Synonyms are (+)-Quassin or Nigakilactone D; Extracts of Quassia amara L. or Picrasma excelsa (Sw.) Planch may be referred to as quassia or Bitter wood extract (synonym).