When the strain was exposed to FLC, the expression of MDR1 increased 3.73-fold. However, the addition of compound 3 or 8 reduced the MDR1 expression in FLC-treated cells by 7.56 or 12.98-fold, respectively (Fig. 4C). These results implied that compounds 3 and 8 could be developed as MDR1 modulators to reverse the azole resistance in Candida species.