(E)-ethyl 2-((5-(ethoxycarbonyl)-2-methylphenyl)diazenyl)-5-guanidino-4-methylbenzoate es una impureza estructural que puede generarse durante la síntesis de ésteres azo con grupo guanidino. Presenta cromóforo azo y grupos éster y guanidino que complican su perfil analítico y su estabilidad en fases ácidas. Su identificación requiere técnicas complementarias como espectrometría de masas de alta resolución | RMN multinuclear y cromatografía líquida acoplada a detectores UV y MS. Deben definirse límites de aceptación por HPLC y estrategias de purificación específicas para minimizar su presencia. El control de parámetros de reacción y condiciones de purificación es crítico para mitigar riesgos de calidad y seguridad.
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