New Acyclic Diterpenic Acids from Yacon (Smallanthus sonchifolius) Leaves

摘要

Two new acyclic diterpenoids, smaditerpenic acid E (la) and F (2a), along with nineteen melampolide-type sesquiterpene lactones, six of them not previously reported in yacon, were isolated from the methylene chloride leaf rinse extract Their structures were elucidated from ID and 2D NMR experiments and gas chromatography coupled to mass spectrometry