Using Cn1ccc(NC(=O)C[C@@H](CO)NC(=O)OC(C)(C)C)n1 to produce Cn1ccc(N2C[C@@H](NC(=O)OC(C)(C)C)CC2=O)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.