Planta Medica 1995-Aug
Pyrrolizidine alkaloids from Eupatorium portoricense.
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Three pyrrolizidine alkaloids were isolated from Eupatorium portoricense and their structures elucidated by spectroscopic methods as (-)-viridifloryl-supinidine (amabiline), (-)-viridifloryl-heliotridine (echinatine), and C12- O-acetyl-(-)-viridifloryl-heliotridine (O(12)-acetylechinatine).