Two new rotenoids, named millettiaosas A–B (1–2), together with four known compounds were isolated
from the roots of Millettia speciosa. Their structures were elucidated on the basis of spectroscopic analysis
including 1D and 2D NMR techniques and HRESIMS. Evaluation of the two new compounds for
cytotoxicity against four human cancer cell lines (MCF-7, HCT-116, A549 and HepG-2) showed moderate
activities (10 mM < IC50 < 26 mM).