Using CCCC1CCC(C2CCC(C3Cc4cc(C)cc(F)c4C3(F)F)CC2)CC1 to produce CCCC1CCC(C2CCC(C3=C(F)c4c(F)cc(C)cc4C3)CC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.