Two new neolignans, namely biseugenol A-B (1-2) were isolated from the bark Litsea costalis. The structures of new compounds
were on the basis of extensive spectroscopic data analysis. The IR and NMR techniques were combined with quantum chemical
calculations in the DFT approach using the hybrid B3LYP exchange-correlation function to confirm the structure of the two new
compounds. Compounds showed excellent anticancer activity against cell lines and antioxidant (DPPH).