Using CCOC(=O)CN1C(=O)C(c2ccc(OC)cc2)CSc2ccccc21 to produce COc1ccc(C2CSc3ccccc3N(CC(=O)O)C2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.