4-Succinic acid, 2,4(1H,3H)-Pyrimidinedione, 5-methyl-1-(2R,4S, 5R)-tetrahydro-5-[[(8-methyl-2-oxido-4H-1,3,2-benzodioxaphosphin-2-yl)oxy]methyl]-2-furanyl ester AIDS-188471 AIDS188471