Cefdinir Thiazolylacetyl Glycine Oxime Impurity, CAS 178949-03-6, is a defined process-related degradant associated with cefdinir synthesis and side-chain transformation chemistry. With molecular formula C7H8N4O4S and molecular weight 244.23 g/mol, it represents a sulfur- and nitrogen-containing heteroatomic impurity that may arise through oxime formation, acyl migration, or hydrolytic rearrangement of thiazolylacetyl intermediates. Its structural similarity to the parent cephalosporin framework requires selective characterization by LC-MS/MS, high-resolution LC-MS, and orthogonal HPLC-UV methods. In impurity profiling, it is evaluated as a non-volatile, polar minor component with relevance to synthetic route control and stability assessment.
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