J Nat Prod. 2000 Aug; 63(8): 1062-5.

Four new clerodane diterpenoids from Callicarpa pentandra.

Xu J, Harrison LJ, Vittal JJ, Xu YJ, Goh SH.

Chemistry Department, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260.

Leaf extracts of Callicarpa pentandra provided four new clerodane-type diterpenoids (1-4), of which 1, 2, and 4 have ring-A-contracted structures. Their structures and stereochemistry were established by spectral data interpretation, and for 3 also by single-crystal X-ray diffraction.