Fig. 5
From: Bioactive isopimarane and 3,4-seco isopimarane diterpenoids from Isodon amethystoides
![Fig. 5](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13065-022-00880-4/MediaObjects/13065_2022_880_Fig5_HTML.png)
Growth inhibitory effects of compound 4 on Hela and A549 cancer cells. The in vitro dose–response was evaluated in the cells at seven twofold serial dilution concentrations with 3 independent experiments. The IC50 values were determined by fitting dose–response curves with the equation log (inhibitor) vs. normalized response–variable slope to the data by using GraphPad Prism software