英文别名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 
