The title compound, C22H32O6, is a sesquiterpene isolated from Pluchea
carolinensis (Compositae). The X-ray structure is consistent with a c
ompound isolated from other species of Pluchea and elucidated from spe
ctroscopic data [Nakanishi, Crouch, Miura, Dominguez, Zamudio & Villar
real (1974). J. Am. Chem. Soc. 96, 609-611].