Using [Li]CCCC, CC(C(=O)O)c1cc(C(F)(F)F)cc(C(F)(F)F)c1 to produce C=CCC(C)(C(=O)O)c1cc(C(F)(F)F)cc(C(F)(F)F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.