Diterpenes from Cycas nitida

摘要

Chemical investigation of the dichlroromethane extracts of Cycas nitida afforded labda-8(17),13(16),14-trien-18-ol (1) from the petiole and rachis;18-hydroxy-isopimara-7,15-diene (2) from the megasporophyll lamina; and a mixture of abietatriene (3)and squalenefrom the roots. The structures of 1-3were elucidated by extensive 1D and 2D NMR spectroscopy.