AIDS-181909 AIDS181909 [(3S,2R,4R,5R)-3-({[(3S,2R,4R,5R)-5-(4-Amino-2-oxohydropyrimidinyl)-4-hydroxy-3-methoxyoxolan-2-yl]methoxy}hydroxythioxophosphinooxy)-5-(2-amino-6-oxohydropurin-9-yl)-4-methoxyoxolan-2-yl]methyl dihydrogen phosphate