Category:
Other Reagent
CAS NO:
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Standard:
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Cefixime Impurity B (E-isomer) is a critical reference standard representing the thermodynamic E-isomer formed during the synthesis of the third-generation cephalosporin antibiotic Cefixime. It arises from isomerization of the oxime moiety, necessitating strict control in pharmaceutical manufacturing. The compound features the molecular formula C16H15N5O7S2 and is identified by CAS No. 90648-89-4.
Store under inert atmosphere at 2°C–8°C to prevent degradation. Handle with appropriate PPE in well-ventilated areas; avoid direct skin contact. Strictly adhere to ICH Q3B guidelines regarding residual impurities in final drug products.