Not Less Than - 95%
Metoprolol Succinate - Impurity C (EP/BP); Bisoprolol Fumarate - Impurity L (Freebase) (EP/BP); 4-[2-Hydroxy-3-[(1-methylethyl)amino]propoxy]benzaldehyde; 4-(2-Hydroxy-3-(isopropylamino)propoxy)benzaldehyde;p-[2-Hydroxy-3-(isopropylamino)propoxy]benzaldehyde; (±)-4-[2-Hydroxy-3-(1-isopropyl)aminopropoxy]benzaldehyde); Metoprolol Related Compound C (USP);