Using O=C1CCc2c(Br)cccc21, COC(=O)c1ccc(CBr)cc1 to produce COC(=O)c1ccc(CC2Cc3c(Br)cccc3C2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.