Using O=C1CCCCCC1, O=C(c1ccc(O)cc1)c1ccc(Br)c(F)c1 to produce Oc1ccc(C(=C2CCCCCC2)c2ccc(Br)c(F)c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.