N-(4-(2-Hydroxy-3-(isopropylamino)propoxy)phenyl)butyramide; Butyranilide, 4′-[2-hydroxy-3-(isopropylamino)propoxy]; N-[4-[2-Hydroxy-3-[(1-methylethyl)amino]propoxy]phenyl]butanamide;N-[4-[(2RS)-2-Hydroxy-3-[(1-methylethyl)amino]propoxy]phenyl]butanamide;Acebutolol EP Impurity E;