The first step is to protect the hydroxyl group of D-glucuronic acid using a protecting group, such as a benzyl group. This is done to prevent unwanted reactions with the hydroxyl group during subsequent reactions.
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methyl (4-retinamidophenyl tri-O-acetyl-β-D-glucopyranosid)uronate
1-benzyl-4-benzyloxy-5-oxo-cyclopent-3-ene-1,3-dicarboxylic acid diethyl ester
2-(2-phenylpropoxy)-1,2-oxaborolane
(4S,5S)-5-Fluoromethyl-5-((S)-toluene-4-sulfinylmethyl)-4,5-dihydro-oxazole-4-carboxylic acid methyl ester
