Depending on the specific substituent you want at the 5-position, you can perform various reactions. For example, if you want a halogen or alkyl group, you can use suitable alkylating or halogenation agents.
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2-[4-({[2-(2,2-dimethyl-propionylamino)-6-methyl-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-ylmethyl]-amino}-methyl)-benzoylamino]-pentanedioic acid
5-Cyclohexyl-2,4-bis-trimethylsilanyloxy-pyrimidine
