Aldovibsanins, Enol Ester Free Vibsane-Type Diterpenes from Viburnum Odoratissimum

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