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pKa1 = 2.16

pKa2 = 8.05

Ref: Newton, D.W., Murray, w.j., Lovell, M.W. pKa Determination of benzhydrylpiperazine antihistamines in aqueous and aqueous methanol solutions (1982) Journal of Pharmaceutical Scienses 71 (12), pp. 1363-1366

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