Caesalpinia sappan L.is a species in Caesalpinia(Leguminosae).The dried heartwood of C.sappan is a traditional medicine,which has been used for years in China.It can promote blood circulation,antibacterial and anti-inflammatory function.This thesis focuses on the chemical investigation and potential anti-depressive activities of cassane diterpenoids isolated from the seeds of C.sappan.The compounds were isolated and purified by repeatedly chromatography with silica gel,Sephadex LH-20,ODS(C-8 and C-18),and M...