1-[4-((3R,7R,10R)-3,7,10-Trimethyl-2,8,9-trioxa-5-aza-1-silabicyclo[3.3.3]undecyloxy)-5-(hydroxymethyl)oxolan-2-yl]-5-methyl-1,3-dihydropyrimidine-2,4-dione AIDS-154778 AIDS154778