1H-Imidazole-4-ethanamine, dihydrochloride 4-(2-Aminoethyl)imidazole dihydrochloride 56-92-8 Histamine chloride Histamine dichloride Histamine dihydrochloride Histamine, dihydrochloride Histaminedium dichloride NSC257873 Peremin WLN: T5M CNJ D2Z &GH 2