Using COC(=O)c1nc(COC(C)=O)c2ccc(Oc3ccc(OC)cc3)cc2c1O to produce COC(=O)c1nc(C)c2ccc(Oc3ccc(OC)cc3)cc2c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.