Using CC(=O)N1C[C@H](NC(=O)c2ccccc2)C(=O)N(CC(=O)OCc2ccccc2)c2ccccc21 to produce CC(=O)N1CC(NC(=O)c2ccccc2)C(=O)N(CC(=O)O)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.