Using O=Cc1ccc(Oc2ccc(Cl)c(C(F)(F)F)c2)c(F)c1, [Li]CCCC to produce C=Cc1ccc(Oc2ccc(Cl)c(C(F)(F)F)c2)c(F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.