A new alkaloid, 9-0-acetyl-7-0-angelyl-retronecine, was isolated from
Senecio triangularis together with 7-0-angelyl-, 9-0-angelyl-, and 7-0
-angelyl-9-0-sarracinylretronecine; S. pseudaureus and S. streptanthif
oliso yielded only retrosine and sene-cionine.