120-73-0 1H-Purine 1H-Purine (9CI) 3,5,7-TRIAZAINDOLE 6H-Imidazo(4,5-d)pyrimidine 7H-Imidazo(4,5-d)pyrimidine 7H-Purine 9H-Purine 9H-Purine (VAN) AI3-50208 EINECS 204-421-2 Imidazo(4,5-d)pyrimidine Isopurine NSC 753 Purine X 128 beta-Purine