HAINANENONE A: A NEW FRIEDELANE TRITERPENOID FROM THE LEAVES AND STEMS OF Drypetes hainanensis

摘要

Phytochemical studies on the petroleum ether extract of Drypetes hainanensis leaves and stems afforded a new friedelane-type triterpene named 23-nor-friedel-3-one. Its structure was established on the basis of spectroscopic methods and chemical evidence.