Using COC(=O)C(Br)Cc1ccc(OCc2nc(-c3ccccc3)oc2C)c(F)c1 to produce COC(=O)C=Cc1ccc(OCc2nc(-c3ccccc3)oc2C)c(F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.