Using Cc1cc(CC=CCc2cc(C)c(O)c(C(C)(C)C)c2)cc(C(C)(C)C)c1O to produce Cc1cc(CCCCc2cc(C)c(O)c(C(C)(C)C)c2)cc(C(C)(C)C)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.