La impureza Methyl 4-butyramido-5-methyl-2-nitrobenzoate | también referida como 4-Butyrylamino-3-methyl-2-nitrobenzoic acid methyl ester | presenta un perfil fisicoquímico caracterizado por un grupo nitro aromático y un éster metílico unido a una amida butirilo | lo que condiciona su polaridad intermedia y estabilidad térmica moderada. En control de calidad se recomienda detección por HPLC con detección UV y confirmación por LC-MS y RMN 1H/13C. Su formación suele deberse a reacciones secundarias durante etapas de esterificación o nitración; su eliminación efectiva requiere fases de extracción orgánica y cromatografía preparativa. Evaluar límites de aceptación | cinética de degradación y potencial interferente en el análisis del material principal.
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