A REVISED STRUCTURE OF CHLORANTHALACTONE-F AND CHLORANTHALACTONE-A PHOTODIMER

Two known lindenane sesquiterpenoids, chloranthalactone F and chlorant halactone A photodimer, were identified to be the same by direct compa rison of the samples and their spectra. Both of their structures were revised to a new structure, head-to-head, anti dimer of chloranthalact one A, from the spectroscopic and chemical studies. Chloranthalactone A photodimer has been reported as an artifact, but this compound was o bserved as a natural product in the leaves of Chloranthus glaber.