Using Fc1ccc(-c2nn3ccccc3c2-c2ccncc2)cc1, O=C1CCC(=O)N1Br to produce Fc1ccc(-c2nn3c(Br)cccc3c2-c2ccncc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.