2-(3-{3-Hydroxy-4-(1,1,2,2-tetramethyl-1-silapropoxy)-5-[(1,1,2,2-tetramethyl-1-silapropoxy)methyl]oxolan-2-yl}-5-methyl-2,6-dioxo-1,3-dihydropyrimidinyl)acetic acid AIDS-111342 AIDS111342