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a tropical African tree, Corynanthe johimbe, whose bark is a source of the alkaloid yohimbine.
an alkaloid, C 21 H 26 N 2 O 3 , extracted from the bark of Corynanthe johimbe or Rauwolfia serpentina, used as a selective alpha-adrenergic receptor antagonist: purported to have aphrodisiac properties.
