Acyclovir alaninate is a guanine-based acyclic nucleoside derivative featuring an L-alanine ester linkage at the 3'-hydroxyl position of acyclovir. This impurity arises via nucleophilic substitution during acyclovir synthesis, incorporating an alanine moiety through an amide bond. The compound retains the acyclic 2'-deoxyribosyl configuration of acyclovir but exhibits enhanced hydrophilicity due to the alaninate ester. It serves as a critical HPLC reference standard for quantifying process-related impurities in antiviral drug substance analysis.
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