Novel cassane diterpenes from the seeds of Caesalpinia minax

Three new cassane diterpenes, sucutiniranes G (1), H (2) and I (3) were isolated from the seeds of Caesalpinia minax Hance. Their structures were elucidated by various spectroscopic techniques (UV, IR, MS, CD, 1D and 2D NMR). All compounds were evaluated for cytotoxic activities against MCF-7 and HepG-2 human cancer cell...