Using CCOC(=O)CBr, O=C(CNC(=O)c1ccc2occc2c1)c1csc(Cl)c1 to produce CCOC(=O)CC(NC(=O)c1ccc2occc2c1)C(=O)c1csc(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.