The molecule is a carboxamidinium ion that is the conjugate acid of 7-formamidino-7-deazaguanine, arising from selective protonation of the imino nitrogen; major species at pH 7.3. It is a conjugate acid of a 7-formamidino-7-deazaguanine.
[amino-(2-amino-4-oxo-3,7-dihydropyrrolo[2,3-d]pyrimidin-5-yl)methylidene]azanium