Valproic Acid EP Impurity L, identified as 2-methylvaleric acid, is a branched-chain aliphatic carboxylic acid with CAS 97-61-0, molecular formula C6H12O2, and molecular weight 116.16 g/mol. In the context of valproate chemistry, it is considered a structurally related process impurity or degradation-associated side product arising from alkyl-chain rearrangement or incomplete synthesis control. Because of its close chromatographic behavior and low volatility, accurate measurement typically requires GC-MS or GC-FID with derivatization, and in complex matrices LC-MS/MS may be used for confirmatory characterization. It is not a genotoxic impurity class, but its presence remains relevant to impurity profile specification and trace-level mass balance assessment.
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