1,4,5,6,8-Pentaazaacennaphthylen-3-amine, 1,5-dihydro-5-methyl-1-.beta.-D-ribofuranosyl- 35943-35-2 AIDS-002725 AIDS002725 BRN 1171593 NSC154020 Pentaazacentopthylene TCN Triciribine Tricyclic nucleoside