The aerial parts of Garberia heterophylla afforded the known guaianoli
de-type sesquiterpene lactone eupahakonesin, 2,6-dimethoxybenoquinone
and the triterpene epifriedelinol. In addition, a new and novel diterp
ene, garberic acid, was isolated. Its structure and stereochemistry wa
s established by spectral methods and single crystal X-ray diffraction
studies.