Using COC(=O)[C@@H](Cc1ccc(OC)cc1)NC(=O)CCc1c[nH]cn1 to produce COc1ccc(C[C@@H](NC(=O)CCc2c[nH]cn2)C(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.