A Impureza C da EP do ácido valpróico, também designada composto relacionado B do ácido valpróico e rac 2-isopropilpentanoico, é o isómero ácido carboxílico racémico do ácido valpróico, CAS 62391-99-5, fórmula C8H16O2 e massa molecular de 144.21 g/mol. É normalmente associada a arrastamento isomérico de processo ou formação secundária durante a síntese de ácidos alquilcarboxílicos ramificados, em vez de degradação oxidativa. Como o isomerismo estrutural pode dificultar a atribuição de picos, a sua determinação recorre frequentemente a cromatografia ortogonal com GC-MS, LC-MS/MS e separações quirais ou de alta resolução. Em contexto farmacopéico e regulatório, é avaliada como substância relacionada.
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