Using FC(Br)(Br)Br, CC[C@H]1CC[C@H]([C@H]2CC[C@H](C=O)CC2)CC1 to produce CC[C@H]1CC[C@H]([C@H]2CC[C@H](C=C(F)Br)CC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.