Using [Li]CCCC, CCc1ccc(-c2ccc(-c3ccc[se]3)c(F)c2F)cc1 to produce CCc1ccc(-c2ccc(-c3ccc(C)[se]3)c(F)c2F)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.