Betahistine dihydrochloride

Etilefrine hydrochloride

Log (rate), log ∆A/∆t

Log (betahistine dihydrochloride) (M)

Log (rate), log ∆A/∆t

Log (etilefrine hydrochloride) (M)

-4.602
-4.436
-4.139
-3.933
-3.824
-3.757
-3.714
-3.645
-3.661

-5.922

-5.621

-5.320

-5.019

-4.843

-4.718

-4.621

-4.542
-4.475

-4.071

-4.176

-3.829

-3.709

-3.664

-3.538

-4.861

-4.639

-4.493

-4.384

-4.296

-4.224

Table 4: Logarithms of the rates, of the reactions of different concentrations of betahistine dihydrochloride and etilefrine hydrochloride with NBD-Cl, at constant concentration of NBD-Cl.