A new labdane diterpenoid, crotonadiol, was isolated from an extract of the
stem bark of Croton zambesicus together with the known clerodane crotocory
lifuran and two trachylobanes: 7 beta-acetoxytrachyloban-18-oic acid and tr
achyloban-7 beta,18-diol. Lupeol, P-sitosterol and its 3-beta-glucopyranosy
l derivative were also isolated. The structure of crotonadiol was determine
d as 8(17),13-labdadiene-6 alpha, 15-diol, by spectral analysis. (C) 1999 E
lsevier Science Ltd. All rights reserved.