To introduce the amino group, you can carry out a nucleophilic substitution reaction. For example, treating the compound from step 2 with ammonia or an amine under suitable conditions should replace the substituent with an amino group.
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3,5-Pyridinedicarbonitrile, 2-amino-6-[(2-oxo-2-phenylethyl)thio]-4-phenyl-
1H-Pyrrole-1-carboxylic acid, 2-[(benzoyloxy)methyl]-5-[(ethoxycarbonyl)amino]-2,5-dihydro-, ethyl ester, cis-
