Using CC(C)(C)OC(=O)CCN1CCOC(c2ccc(Oc3ccccc3)cc2)C1 to produce O=C(O)CCN1CCOC(c2ccc(Oc3ccccc3)cc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.