A impureza Sulfametoxazol EP Impurity F (CAS 17103-52-5) | também referida como Sulfamethoxazole Related Compound F ou 5-sulfanilamido-3-metilisoxazole | é um derivado isoxazol substituído identificado como processo- ou degradação-relacionado no controle do sulfametoxazol. Sua caracterização analítica habitualmente envolve HPLC com detecção UV | LC-MS para confirmação de massa e espectroscopia para atribuição estrutural. Apresenta comportamento cromatográfico distinto e estabilidade relativa em condições ácidas e térmicas | tornando necessária a validação de métodos de quantificação e limites especificados segundo a Farmacopeia Europeia. Monitoração e investigação de vias de formação permitem mitigar sua presença em matérias-primas e lotes finais.
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