Norsesquiterpenes from the stems and leaves of Pinellia pedatisecta Schott.

A chemical investigation of the stems and leaves of Pinellia pedatisecta Schott afforded forty norsesquiterpenes, including eleven undescribed compounds (1-6, 10-13, and 23) and twenty-nine known analogues. Their structures were elucidated using detailed spectroscopic and comparative literature data analysis. The Mo