Using COC(=O)c1nc(COC(C)=O)c2c(Oc3ccccc3)cccc2c1O to produce COC(=O)c1nc(C)c2c(Oc3ccccc3)cccc2c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.