69281-33-0 Guanosine 5'-phosphoimidazolide Guanosine 5'-phosphorimidazolineguanosine, 5'-(hydrogen 1H-imidazol-1-ylphosphonate) Guanosine 5'-phosphoroimidazolide Guanosine, 5'-(hydrogen 1H-imidazol-1-ylphosphonate) ImpG