Fruticolone (1) and isofruticolone (2), both isolated from Teucrium fruticans, have been shown by a combination of spectroscopic and X-ray methods (R 0.070; 1 620 observed diffractometer reflections) to be ent-19-acetoxy-4β,18 : 15,16-diepoxy-1β-hydroxycleroda-13(16),14-dien-6-one and ent-19-acetoxy-4β,18 : 15,16-diepoxy-6α-hydroxycleroda-13(16),14-dien-1-one, respectively.
G. Savona, S. Passannanti, M. P. Paternostro, F. Piozzi, J. R. Hanson, P. B. Hitchcock and M. Siverns, J. Chem. Soc., Perkin Trans. 1, 1978, 356 DOI: 10.1039/P19780000356
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