A new type of Annonaceous acetogenin was isolated from the roots of Goniothalamus
donnaiensis. The structures of two epimeric pairs, donnaienin A (1) and 34-epi-donnaienin A
(1¢), and donnaienin B (2) and 34-epi-donnaienin B (2¢), characterized by the presence of a
ç-(hydroxymethyl) ç-lactone moiety, were elucidated by spectroscopic analysis and chemical
derivatization. Four known mono-THF acetogeninssmurisolin, isoannonacin, and a mixture
of annonacin and goniothalamicinswere also isolated