.beta.-D-2'-Deoxy-3-deaza G 3-Deaza-2'-deoxyguanosine 4H-Imidazo[4,5-c]pyridin-4-one, 6-amino-1-(2-deoxy-.beta.-D-erythro-pentofuranosyl)-1,5-dihydro- 87202-41-3 AIDS-001821 AIDS001821