2(1H)-Pyrimidinone, 3,4-dihydro-4-imino-1-(3-O-phosphono-.beta.-L-ribofuranosyl)-, compd. with 3,4-dihydro-4-imino-1-(5-O-phosphono-.beta.-L-ribofuranosyl)-2(1H)-pyrimidinone (1:1) AIDS-129820 AIDS129820 NSC369002