A Impureza EP E do Ácido Valpróico, identificada como valeramida ou pentanamida, é a amida primária do ácido valérico e uma impureza de processo estruturalmente distinta em materiais relacionados ao valproato. Com CAS 626-97-1, fórmula molecular C5H11NO e massa molar 101,15 g/mol, pode surgir por vias de amidacão ou a partir de intermediários residuais associados à química de ácidos carboxílicos alifáticos. Sua baixa polaridade e volatilidade moderada favorecem a separação cromatográfica por GC-MS e LC-MS/MS, enquanto a confirmação de identidade é frequentemente apoiada por RMN e espectroscopia IV. Embora não pertença à classe de nitrosaminas nem constitua alerta estrutural do ICH M7, permanece relevante no perfil de impurezas por sua origem sintética e possível arraste no processo de fabricação.
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