Using CC(C)(C)c1cc(CC=Cc2ccccc2)c(O)c(C(C)(C)C)c1 to produce CC(C)(C)c1cc(CCCc2ccccc2)c(O)c(C(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.