Aldovibsanin A (1), 7-epi-aldovibsanin A (2) and aldovibsanin B (3), novel
vibsane-type diterpenes without a beta,beta-dimethylacrylate group, have be
en isolated from the leaves of Viburnum odoratissimum, and their structures
have been elucidated by spectroscopic analyses and chemical correlation wi
th vibsanin C (4).