Using BrCCc1ccccc1, COc1ccc2c(c1)sc1ncc(C=O)n12 to produce COc1ccc2c(c1)sc1ncc(C(O)CCc3ccccc3)n12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.