4H-1,3,2-Benzodioxaphosphin-4-acetic acid, 5-chloro-2-[[(2S,5R)-5-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-2,5-dihydro-2-furanyl]methoxy]-, ethyl ester, 2-oxide AIDS-188479 AIDS188479