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Annonamine is a benzylisoquinoline alkaloid isolated from Annona muricata (commonly known as soursop, graviola, guanabana, paw-paw and sirsak), a plant commonly used in folk medicine by indigenous communities in Africa and South America. Structurally, it contains a aporphine core featuring a quaternary ammonium group.
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Annonamine Wikipedia(Text) CC BY-SA