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The recently-discovered nucleobase 5-carboxylcytosine (caC) is the final product of oxidative attack on the 5 position of cytosine. It can exist in solution in an equilibrium of different protonated and unprotonated forms within a range of pH, although only the zwitterionic caC ± and the anionic caC − species have been detected in the liquid phase. In this work, four proton-transfer...
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