Using O=C(O)c1ccc2cncn2c1Nc1ccc(Br)cc1F, C=COCCON to produce C=COCCONC(=O)c1ccc2cncn2c1Nc1ccc(Br)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.