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Potentiometric titration curves of (A) the PAMAM_E5.NH2 amino terminated dendrimer (starting material), (B) its acetylated derivative obtained after the first step of synthetic path, clearly showing shift of the end point of titration of primary amino groups upon acetylation and (C) E5.(NHAc)72(NHBT)8(NHSAH)39 showing disappearance of NH2 groups.
