(E)-Cefdinir, CAS 178601-88-2, es el isómero geométrico E de cefdinir, una cefalosporina de tercera generación, y debe considerarse una impureza de proceso o degradación estructuralmente relacionada más que una entidad farmacológica independiente. Con fórmula molecular C14H13N5O5S2 y peso molecular de 395.41 g/mol, conserva el núcleo cepémico, la función oxima y la cadena lateral con azufre características del fármaco original. Su formación puede producirse durante la síntesis, por isomerización o bajo estrés fotolítico o ácido. La detección a niveles traza suele requerir LC-MS/MS, LC-MS de alta resolución y métodos HPLC ortogonales para lograr separación cromatográfica frente al isómero activo.
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