Albendazole EP Impurity G

Albendazole EP Impurity G is a benzimidazole-derived compound featuring a 5-(2-propenyl) substituent and a sulfonyl group, formed via oxidative degradation of the parent drug's thiol functionality. The structure incorporates a 1H-benzimidazole core linked to a branched alkyl chain bearing an N-methylamino moiety, distinguishing it from the parent molecule by an additional methyl group and sulfonyl oxidation state. This impurity arises during synthetic processes involving thiol oxidation and alkylation side reactions. It serves as an HPLC reference standard for quantifying process-related impurities in albendazole formulations.