Labetalol Impurity 12Labetalol EP impurity DLabetalol EP Impurity D HClLabetalol Impurity(Hydrochloride)Labetalol EP Impurity D HydrochlorideLabetalol Hydrochloride EP Impurity D5-(2-amino-1-hydroxyethyl)-2-hydroxybenzamideLabetalol Hydrochloride Impurity 4 (Labetalol Hydrochloride EP Impurity D)