Using CCCOc1ccc(-c2ccc(-c3ccc[se]3)cc2)c(F)c1F, [Li]CCCC to produce CCCOc1ccc(-c2ccc(-c3ccc(C)[se]3)cc2)c(F)c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.