Two pimarane diterpenoids from Ephemerantha lonchophylla and their evaluation as modulators of the multidrug resistance phenotype.

Abstract excerpt

Two new pimarane diterpenoids, lonchophylloids A (1) and B (2), were isolated from the stems of Ephemerantha lonchophylla. The structures of 1 and 2 were established predominantly through the application of extensive 1H-and 13C-NMR, 1D- and 2D-homonuclear and heteronuclear correlation NMR experiments, and X-ray diffraction methods. Consistent with structure--activity predictions, both compounds were capable of...

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