Cefdinir Thiazolylacetyl Glycine Oxime Acetal Impurity, CAS 178422-40-7, is a process-related synthetic impurity associated with cefdinir manufacturing or intermediate transformation. With molecular formula C7H10N4O4S and molecular weight 246.24 g/mol, it represents a heteroatom-rich oxime acetal derivative containing sulfur and multiple nitrogens, consistent with side-chain derivatization or incomplete cyclization during semisynthetic cephalosporin construction. Its structural assignment typically requires LC-MS/MS coupled to high-resolution MS, with complementary LC-UV and NMR confirmation. Because such impurities may arise from reaction carryover or degradative rearrangement, they are evaluated within impurity profiling and ICH M7-relevant risk assessment frameworks when structural alerts or trace persistence warrant scrutiny.
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