La Cefdinir Thiazolylacetyl Glycine Oxime Impurity, CAS 178949-03-6, es una impureza de proceso y degradación bien definida asociada con la síntesis de cefdinir y con la química de transformación de la cadena lateral. Con fórmula molecular C7H8N4O4S y peso molecular de 244.23 g/mol, corresponde a una entidad heteroatómica rica en azufre y nitrógeno que puede originarse por formación de oxima, migración de acilo o reordenamiento hidrolítico de intermedios thiazolylacetyl. Por su similitud estructural con el núcleo cefalosporínico, su caracterización exige LC-MS/MS, LC-MS de alta resolución y métodos ortogonales de HPLC-UV. En el perfil de impurezas se considera un componente polar, no volátil, relevante para el control de la ruta sintética y la evaluación de estabilidad.
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