Acylate the 5-position of the pyrimidine ring with the desired acyl group. This can be done using acylating agents and suitable conditions.
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5-acetyl-4-β-D-glucopyranosylamino-2-methylthio-6-oxopyrimidine
1,3,4,6-tetra-O-benzoyl-α,β-D-fructofuranose
