Using COc1ccc(-c2coc3cc(OC(C)=O)ccc3c2=O)cc1OC to produce COc1ccc(C2COc3cc(OC(C)=O)ccc3C2O)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.