Descarboxymethyl-N-carboxyethyl Lacosamide

Descarboxymethyl-N-carboxyethyl Lacosamide is a structurally related impurity derived from Lacosamide through decarboxylation of the methyl-substituted carboxylic acid moiety and N-alkylation with a carboxyethyl group. The molecule retains the core cyclohexane sulfonamide scaffold but features an ethyl ester linkage at the nitrogen and a desaturated methyl terminus. This impurity arises during synthetic pathways involving esterification or amidation steps. It serves as a critical HPLC reference standard for quantifying process-related impurities in Lacosamide formulations.