????????????? 2-chloro-2-5-dihydroxyacetophenone Norepinephrine Impurity 28 Norepinephrine Impurity 19 HCl noradrenalinequinone Catechol Norepinephrine Impurity 26 HCl 4-(2-Chloro-1-hydroxyethyl)-1,2-benzenediol 3,4-Dihydroxyacetophenone 3-(2-amino-1-hydroxyethyl)benzene-1,2-diol Norepinephrine Impurity 18 HCl Norepinephrine Impurity 24 HCl 3,4-dihydroxy-α-aminoacetophenone hydrochloride DL-Adrenalin noradrenochrome Norepinephrine Impurity 15 Norepinephrine Impurity 2 Norepinephrine Impurity 17 HCl (rac-Norepinephrine HCl)