To introduce a functional group at the C-4 or C-5 position, you can utilize various reactions, including nucleophilic substitution, aromatic substitution, or addition reactions, depending on the nature of the functional group you want to add.
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DIMETHYL 4-IODO-1H-PYRAZOLE-3,5-DICARBOXYLATE
3-Oxazolidinecarboxylic acid, 2,2,4,4-tetramethyl-, (2S)-2-[bis(phenylmethyl)amino]-1,4-butanediyl ester
