Pyrrolizidine alkaloids from Eupatorium portoricense.
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).
Wiedenfeld
H
H
Guerrero
R
R
Roeder
E
E