Using COc1cccc(C2=C(OC(C)=O)c3ccc(OC)cc3CC2)c1 to produce COc1cccc(-c2ccc3cc(OC)ccc3c2OC(C)=O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.