Using [Li]CCCC, O=Cc1ccc(Oc2ccc(Cl)c(OC(F)(F)F)c2)cc1 to produce C=Cc1ccc(Oc2ccc(Cl)c(OC(F)(F)F)c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.