Using O=C1CCC(=O)N1Br, CC1(C)N=C(c2ccccc2F)c2cc([N+](=O)[O-])ccc2NC1=O to produce CC1(C)N=C(c2ccccc2F)c2cc([N+](=O)[O-])cc(Br)c2NC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.