Acetamide, N-[(4E)-6-[(2R,3S,5R)-5-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-3-[[(1,1-dimethylethyl)diphenylsilyl]oxy]tetrahydro-2-furanyl]-6-hydroxy-4-hexen-1-yl]-2,2,2-trifluoro-