The structure and absolute configuration of the recently isolated sesquiterpenoid lactone, melampodin, have been determined by X-ray crystallography using direct statistical methods; a revised constitutional formula is also given for heliangine.
S. Neidle and D. Rogers, J. Chem. Soc., Chem. Commun., 1972, 140 DOI: 10.1039/C39720000140
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