The absolute structure of vibsanin C, a novel 7-membered vibsane-type
diterpene isolated from the leaves of Viburnum awabuki, has been estab
lished by X-ray crystallographic analysis of its derivative. Vibsanin
C has been proved to be one of Cope rearranged products from vibsanin
B, a 11-membered vibsane-type diterpene. (C) 1997 Elsevier Science Ltd
.