in the series Acetogenins of Annonaceae. For part 86 see Szlosek M, Peyrat J-F, Chaboche C, Franck X, Hocquemiller R, Figadère B. Synthesis of a highly functionalized precursor of (-)-4-deoxygigantecin, an Annonaceous acetogenin - Part,87. (New Journal of Chemistry, 2000)