N-[3-Acetyl-4-[(2RS)-oxiran-2-ylmethoxy]phenyl]butanamide ; N-[3-Acetyl-4-(oxiranylmethoxy)phenyl]butanamide; 3'-Acetyl-4'-(2,3-epoxypropoxy)butyranilide; N-(3-acetyl-4-(oxiran-2-ylmethoxy)phenyl)butyramide;Acebutolol Hydrochloride - Impurity A;