Plecostonol, a new diterpenoid having a rare 3,20-epoxy-ent-kaurene skeleton, has been isolated from Plectranthus coesta Buch-Ham, and assigned the structure ent-3β,20β-epoxy-3α,7β,14α-trihydroxy-kaur-16-ene-15-one (1) on the basis of its spectral properties and an X-ray crystallographic determination.
A. P. Phadnis, S. A. Patwardhan, A. S. Gupta, N. N. Dhaneshwar, S. S. Tavale and T. N. Gururow, J. Chem. Soc., Perkin Trans. 1, 1986, 655 DOI: 10.1039/P19860000655
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