Using Cn1cnc2c(F)c(Nc3ccc(Br)cc3F)c(C(=O)O)nc21, C=COCCON to produce C=COCCONC(=O)c1nc2c(ncn2C)c(F)c1Nc1ccc(Br)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.