2(1H)-Pyrimidinone, 1-[3-O-[[[5-(3,4-dihydro-4-imino-2-oxo-1(2H)-pyrimidinyl)tetrahydro-2-furanyl]methoxy]hydroxyphosphinyl]pentofuranosyl]-4-(octadecylamino)- AIDS-153258 AIDS153258 NSC699499