1-[4-(2-Hydroxyethyl)phenoxy]-2,3-epoxypropane;ZB-2;[[4-[2-(CyclopropylMethoxy)ethyl]phenoxy]Methyl]oxirane;2-[[4-[2-(cyclopropylMethoxy)ethyl]phenoxy]Methyl]oxirane;Betaxolol IMp. C (EP);Betaxolol IMp. C (EP)-d5;Betaxolol impurity C;Betaxolol EP Impurity C