O-Acetyl Lacosamide

O-Acetyl Lacosamide is a structurally related API impurity derived from the antiepileptic drug Lacosamide, featuring an acetoxy group appended to the pyrrolidinone ring oxygen. This modification introduces an additional acetyl moiety, altering the compound's hydrophilicity while retaining the core 4-chlorophenyl-substituted pyrrolidin-2-one scaffold. The stereochemistry at the chiral center remains intact, preserving enantiomeric identity. Synthetically, this impurity arises via acetylation side reactions during API synthesis, typically under esterification conditions. Analytically, it serves as a reference standard for HPLC-based quantification of process-related impurities in Lacosamide formulations.