New Cassane Diterpenoids from Caesalpinia sappan and their Antiplasmodial Activity

One new cassane diterpene possessing an unusual bridge between C-19 and C-20 named caesalsappanin R ( ), as well as another new diterpene caesalsappanin S ( ), were isolated from the seeds of with methanol extract. Their structures were determined by spectroscopic analysis and examined alongside existing data from prior studies. Their biological activities were profiled by their antiplasmodial activity.