Cefazolin EP Impurity E, identified as 5-methyl-1,3,4-thiadiazol-2-thiol (CAS 29490-19-5), is a heteroaromatic sulfur-containing process-related impurity associated with cephem synthesis and degradation chemistry. With molecular formula C3H4N2S2 and molecular weight 132.21 g/mol, it represents a small-molecule thiol that may arise from cleavage or carryover of thiadiazole-derived intermediates used in cefazolin manufacture. Its volatility, polarity, and sulfur functionality can require orthogonal characterization by LC-MS/MS, GC-MS, and, where needed, derivatization-enhanced methods. Regulatory assessment focuses on impurity fate, identification thresholds, and specification control under pharmacopeial and ICH expectations.
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