An Me2CO extract of Euphorbia seguieriana (Euphorbiaceae) afforded sev
en new diterpene polyesters (1-7). Five of them (1-5), having a new pa
rent alcohol that was named 17-hydroxymyrsinol were structurally relat
ed to myrsinol. The other two compounds (6, 7) were new derivatives of
the known parent alcohols cyclomyrsinol and lathyrane. The structure
elucidations of the new compounds by highfield spectroscopic methods,
including 1D and 2D NMR techniques, are described.