Using O=C1CCC(=O)N1Br, CCOC(=O)c1ncc2c(c1O)c(Br)c(Br)n2Cc1ccccc1F to produce CCOC(=O)c1nc(Br)c2c(c1O)c(Br)c(Br)n2Cc1ccccc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.