Atramacrolodes A−D (1–4), Four Undescribed Eudesmane‐Type Sesquiterpenes from the Rhizome of Atractylodes macrocephala

Four undescribed sesquiterpenes, atramacrolodes A-D (1-4), along with six known compounds 5-10 were isolated from the rhizome of Atractylodes macrocephala. Compound 3 possessed a new skeleton based on an unprecedented carton-carton connection. Their structures were determined by UV, IR, HRESIMS, NMR spectra,