Using CCOC(=O)CBr, Oc1ccc2cc(-c3cc4ccccc4s3)ccc2c1Cl to produce CCOC(=O)COc1ccc2cc(-c3cc4ccccc4s3)ccc2c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.