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5 μg/ml. 5‑hydroxy‑7,8‑dimethoxyflavanone slightly changed P-gp's conformation and only stimulated ATPase at very high concentration (100 μg/ml). The docking results showed that 5‑hydroxy‑7,8‑dimethoxyflavanone and verapamil exhibited similar binding affinity to P-gp. The MDR reversing effects were prominent in the vincristine group, the reversal folds were 23.01 and 13.03 when combined with 10 μg/ml 5‑hydroxy‑7,8‑dimethoxyflavanone in the P-gp over-expressing cell line (ABCB1/Flp-In™-293) and MDR cancer cell line (KB/VIN), respectively.