The molecule is an imidazolium ion resulting from the protonation of the 3-position of the imidazole moiety of 5-aminoimidazole ribonucleoside. The major species at pH 7.3. It is a conjugate acid of a 5-aminoimidazole ribonucleoside.
(2R,3R,4S,5R)-2-(4-amino-1H-imidazol-3-ium-3-yl)-5-(hydroxymethyl)oxolane-3,4-diol