2-(3-{4-Hydroxy-3-(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-111341 AIDS111341