Using CC1Cc2c(-c3cc(C(C)(C)C)cc(C(C)(C)C)c3)cccc2C1O to produce CC1=Cc2cccc(-c3cc(C(C)(C)C)cc(C(C)(C)C)c3)c2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.