Figure 2: Representative chromatograms of: (A) rat serum containing the internal standard, daidzein, and vorinostat at a concentration of 50 μg/ml.; (B) blank rat serum showing no interfering peaks co-eluted with the compounds of interest; (C) rat urine containing the internal standard, daidzein, and vorinostat at a concentration of 25 μg/ml; and (D) blank rat urine showing no interfering peaks co-eluted with the compounds of interest.