Using COc1ccc(C2Cc3cc(Br)c(OC)cc3C3CCCCC23)cc1, [Li]C(C)(C)C to produce COc1ccc(C2Cc3cc(C)c(OC)cc3C3CCCCC23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.