Abietane diterpenoids from Isodon lophanthoides var. graciliflorus and their cytotoxicity

► Seven new and three known abietane diterpenoids were isolated. ► Their structures were identified by spectroscopic data. ► Cytotoxicity was evaluated against A549, MCF-7, and HeLa cell lines. ► The IC50 values of compounds 1, 2, 5, 6, 8, and 9 were 1.79-52.67 μM.