Triethylamine 4-(((2R,3R,4R,5R)-2-((bis(4-methoxyphenyl)(phenyl)methoxy)methyl)-5-(2-isobutyramido-6-oxo-1,6-dihydro-9H-purin-9-yl)-4-(2-methoxyethoxy)tetrahydrofuran-3-yl)oxy)-4-oxobutanoate

protected nucleoside intermediate

Diacetamate