拉贝洛尔EP杂质B HCL(非对映异构体混合物); 拉贝洛尔1-羧酸甲酯盐酸盐; 拉贝洛尔杂质B(EP); 盐酸拉贝洛尔杂质B(EP); 拉贝洛尔EP杂质C; 拉贝洛尔EP杂质B; 拉贝洛尔EP杂质B盐酸盐; Benzoic acid, 2-hydroxy-5-[1-hydroxy-2-[(1-methyl-3-phenylpropyl)amino]ethyl]-, methyl ester, hydrochloride (1:1); Labetalol EP Impurity B HCl (Mixture of Diastereomers); Labetalol Impurity B HCl (Mixture of Diastereomers); Methyl 2-Hydroxy-5-[1-hydroxy-2-[(1-methyl-3-phenylpropyl)amino]ethyl]benzoate Hydrochloride; Labetalol EP Impurity B HCl; Labetalol Hydrochloride Impurity B as Hydrochloride