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, 13C NMR calculation with DP4+ analysis, and the comparison of experimental and calculated ECD spectra. Compounds 5 and 8 showed protective effects against paracetamol‐induced liver cell injury.