Using O=C(NCC(=O)c1ncc(Br)cc1Br)c1ccccc1C(F)(F)F, CCON to produce CCON=C(CNC(=O)c1ccccc1C(F)(F)F)c1ncc(Br)cc1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.