Leucocyclus formosus

The dienamides (5) [13] and (7) [14] have been isolated from Leucocyclus formosus and the tetradecadienoylpyrrolidine (8) and piperidine (9) have been found in Achillea arten [14] and Otanthus maritimus [15] respectively. The isobutylamides (10-12) have been extracted from the fruits of Piper guineense collected in the western parts of Nigeria [16]. Trichonine (13) and compounds (12) and (16) have the longest dienamide chains isolated so far and they are found in Piper trichostachyon leaves [17]. 

---