Using COC(=O)c1cc(C(=O)c2c(C)c(OC)c3c(OCc4ccccc4)cccn23)ccc1N to produce COC(=O)c1cc(C(=O)c2c(C)c(OC)c3c(O)cccn23)ccc1N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.