Using O=C1CCC(=O)N1Br, C=Cc1ccc2ccc3ncc(Cl)cc3c(=O)c2c1 to produce O=c1c2cc(C3CO3)ccc2ccc2ncc(Cl)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.