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The ionization constants (pKa) and the pH-dependent solubility (log S-pH) of six phenothiazine derivatives (promazine hydrochloride, chlorpromazine hydrochloride, triflupromazine hydrochloride, fluphenazine dihydrochloride, perphenazine free base, and trifluoperazine dihydrochloride) were determined at 25 and 37°C. The pKa values of these low-soluble surface active molecules were determined by the...
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