El 7-epímero de cefdinir (CAS 178601-89-3) es una impureza estereoquímica de la clase de las cefalosporinas que se origina por epimerización en la posición 7 de la cadena lateral oxima, generalmente durante la síntesis o bajo estrés ácido, básico o térmico. Presenta fórmula molecular C14H13N5O5S2 y peso molecular de 395,41 g/mol. Como la variación es configuracional y no composicional, se clasifica como sustancia relacionada que requiere caracterización ortogonal. Su identificación y cuantificación suelen requerir LC-MS en fase reversa, LC-MS/MS y métodos cromatográficos quirales o de alta resolución, ya que la detección UV por sí sola puede ser insuficiente.
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