Acyclovir EP Impurity R is a defined process- and degradant-related related substance associated with the guanine analog antiviral acyclovir. With molecular formula C17H22N10O6 and molecular weight 462.43, it represents a heavily substituted nucleoside derivative whose structural features are consistent with oxidative or synthetic route-derived modification of the acyclic side chain and heterocyclic base. Such impurities are typically monitored by stability-indicating reversed-phase HPLC, with orthogonal confirmation by LC-MS/MS and, where necessary, high-resolution MS or NMR. In a regulatory context, this impurity is evaluated as a specified impurity within pharmacopeial and ICH impurity control paradigms.
References
O’Brien, John J., and Deborah M. Campoli-Richards. “Acyclovir.” Drugs, vol. 37, no. 3, Mar. 1989, pp. 233–309, 10.2165/00003495-198937030-00002.
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