Using COC(C=C(C)C=CC1=C(C)CCCC1(C)C)CC(C)=CCO to produce COC(C=C(C)C=CC1=C(C)CCCC1(C)C)CC(C)=CC=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.