Metoprolol Tartrate standard

(±)1-(Isopropylamino)-3-[p-(β-methoxyethyl)phenoxy]-2-propanol (+)-tartrate salt; 2-Propanol, 1-[4-(2-methoxyethyl)phenoxy]-3-[(1-methylethyl)amino]-, (±)-, [R-(R*,R*)]-2,3-dihydroxy butanedioate (2:1) (salt); ±)-1-(Isopropylamino)-3-[p-(2-methoxyethyl)phenoxy]-2-propanol (+)-tartrate (2:1) (salt); 1-(Isopropylamino)-3-[4-(2-methoxyethyl)phenoxy]propan-2-ol l-tartrate (USP);