Using COc1cc(C(C)C)c(OC)c2c1C1(C)CCC(=O)C(C)=C1CC2 to produce COc1cc(C(C)C)c(OC)c2c1C1(C)CCC(=O)C(C)C1CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.