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Three-dimensional chromatograms obtained for phenytoin (PHT) oral suspensions after applying different stress conditions. (a) No stress; (b) HCl 0.5 M at 80 °C for 4 h; (c) NaOH 1 M at 80 °C for 4 h; (d) H2O2 3% at 80 °C for 4 h; (e) 80 °C for 4 h. SF: solvent front.
