Synonyms: HISTAMINE-ALPHA,ALPHA,BETA,BETA-D4 2HCL;HISTAMINE-ALPHA,ALPHA,BETA,BETA-D4 DIHYDROCHLORIDE;Histamine2HCl (alpha,alpha,|beta|,|beta|-D4);Histamine-alpha-D2,|beta|-D2 2HCL;1-H-Imidazole-4-ethanamine-d4;5-Imidazole-ethylamine-d4;b-Aminoethylimidazole-d4;Histamine-a,a,b,b-d4 Dihydrochloride