Hastifolins A-G, antifeedant neo-clerodane diterpenoids from Scutellaria hastifolia

From the aerial parts of Scutellaria hastifolia, family Lamiaceae (Labiatae), seven neo-clerodane diterpenoids (hastifolins A-G) were isolated. Six of the products form three pairs of epimers at C-13. Hastifolins A-C showed significant antifeedant activity.