Figure 7. Compound 6b inhibited the colony formation of MCF-7 and MCF-7/DOX carcinoma cells.
MCF-7 and MCF-7/DOX cells were treated with compound 6b at 0.25–1 μM for 24 h and cultured for 14 d until the colonies were visible. Crystal violet solution was used to stain the colonies for 4 h and imaged (A) and counted (B).