13alpha-Hydroxymethylenedeacetyllaurenobiolide, a new germacranolide from Tanacetopsis mucronata

摘要

The new sesquiterpene lactone 13-hydroxymethylenedeacetyllaurenobiolide was isolated from the aerial part of Tanacetopsis mucronata S.Koval (Asteraceae). Its structure was established using spectral data and X-ray structure analysis. The germacranolide macrocycle has the chair-chair conformation with the configuration _1D~(14), ~(15)D_5.