A Cefdinir Thiazolylacetyl Glycine Oxime Impurity, CAS 178949-03-6, é uma impureza de processo e de degradação definida, associada à síntese de cefdinir e à química de transformação da cadeia lateral. Com fórmula molecular C7H8N4O4S e massa molecular de 244.23 g/mol, trata-se de uma espécie heteroatômica contendo enxofre e nitrogênio, potencialmente formada por oximação, migração de acila ou rearranjo hidrolítico de intermediários thiazolylacetyl. Pela semelhança estrutural com o núcleo cefalosporínico, sua caracterização requer LC-MS/MS, LC-MS de alta resolução e métodos ortogonais de HPLC-UV. No perfil de impurezas, é considerada um componente polar, não volátil, relevante para o controle da rota sintética e para a avaliação de estabilidade.
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