Lacosamide imp B(R)-O-Acetyl-LacosaMideLacosamide O-Acetyl ImpurityLacosamide EP Impurity B (R-Isomer)Lacosamide Impurity 2(Lacosamide EP Impurity B)Lacosamide EP Impurity B((R)-O-Acetyl-Lacosamide)(R)-2-Acetamido-3-(benzylamino)-3-oxopropyl Acetate[(2R)-2-acetamido-3-(benzylamino)-3-oxopropyl] acetateLacosamide EP Impurity B (Lacosamide O-Acetyl Impurity)(2R)-2-(acetylamino)-3-(benzylamino)-3-oxopropyl acetate