Effects of 2,2′,4,4′-tetrabrominated biphenyl ether (BDE-47), Isoliquiritigenin (ISL), Licochalcone B (LCB) alone, and BDE-47 combined with ISL and LCB on RAW264.7 cell viability. (A–C) Effects of BDE-47 (0–100 μM), ISL (0–40 μM), and LCB (0–40 μM) on cell viability. (D) Effects of different concentrations of ISL combined with BDE-47 on cell viability. (E) Effects of different concentrations of LCB combined with BDE-47 on cell viability. There was a significant difference compared to the control group (** p < 0.01). There was a significant difference compared to the BDE-47 group (## p < 0.01).