Valproic Acid EP Impurity E, identified as valeramide or pentanamide, is the primary amide corresponding to valeric acid and a structurally distinct process-related impurity in valproate-related materials. With CAS 626-97-1, molecular formula C5H11NO, and molecular weight 101.15 g/mol, it arises plausibly from amidation pathways or from residual intermediates associated with aliphatic carboxylic acid chemistry. Its low polarity and modest volatility favor chromatographic separation by GC-MS and LC-MS/MS, with identity confirmation often supported by NMR and IR spectroscopy. Although not a nitrosamine or ICH M7 structural alert class, it remains relevant to impurity profiling because of synthetic origin and potential carryover in manufacturing streams.
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