1H-Imidazole-4-ethanamine, phosphate (1:2) 2-Imidazol-4-ylethylamine orthophosphoric acid (1:2) 4-(2-Aminoethyl)imidazole bis(dihydrogen phosphate) 4-(2-Aminoethyl)imidazole di-acid phosphate 51-74-1 53623-99-7 74-56-6 EINECS 200-118-4 Histamine acid phosphate Histamine biphosphate Histamine dihydrogen phosphate Histamine diphosphate Histamine phosphate Histamine phosphate (1:2)