The absolute configurations of 19-acetylgnaphalin, and another diterpenoid from T. gnaphalodes, probably identical with teucrin P1, have been determined by X-ray analysis; they belong to the neoclerodane series. Isofruticolone has also been shown to belong to this series.
M. Martinez-Ripoll, J. Fayos, B. Rodriguez, M. C. Garcia-Alvarez, G. Savona, F. Piozzi, M. Paternostro and J. R. Hanson, J. Chem. Soc., Perkin Trans. 1, 1981, 1186 DOI: 10.1039/P19810001186
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