Journal of Natural Products 2000-Dec
New eudesmane sesquiterpenes from Plectranthus cylindraceus.
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Three new eudesmane sesquiterpenes, plectranthone (1), desacetylplectranthone (2), isodeacetylplectranthone (3), and the three known flavonols pachypodol, casticin, and chrysosplenol D were isolated for the first time from the aerial parts of Plectranthus cylindraceus. Their structures have been established on the basis of spectral data. The structures and relative stereochemistries of 1 and 2 were confirmed by single-crystal X-ray analysis.