Using O=C1Nc2cccc3cccc1c23, CC(=O)c1cccc2c(Br)cc(Br)cc12 to produce O=C1Nc2c(Br)cc(Br)c3cccc1c23, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.