(E)-Cefdinir, CAS 178601-88-2, is the E-configured geometrical isomer of the third-generation cephalosporin cefdinir and should be regarded as a structurally related process or degradation impurity rather than a distinct pharmacological entity. With molecular formula C14H13N5O5S2 and molecular weight 395.41 g/mol, it preserves the cephem nucleus, oxime functionality, and sulfur-containing side chain characteristic of the parent drug. Formation may arise during synthesis, isomerization, or stress exposure under photolytic or acidic conditions. Trace-level determination typically relies on LC-MS/MS, high-resolution LC-MS, and orthogonal HPLC methods because chromatographic resolution from the active isomer is critical for impurity profiling.
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