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Three flavone derivatives, XHN22, XHN26, XHN27 (A, B, C) and the active principal of Triptergium wilfordii, TQA (D) are potent inhibitors of aromatase activities. Lines shown are fits of these four inhibitors giving IC50 of 1.60±0.07 μmol/L, 2.76±0.24 μmol/L, 0.81±0.08 μmol/L, and 45.8±11.3 μmol /L, respectively. Values are represented as mean±SEM of three independent experiments (n=3).
