Using COC(=O)C(Cc1ccccc1)Oc1ccc2cc(-c3ccc(-c4ccccc4)[nH]3)ccc2c1 to produce O=C(O)C(Cc1ccccc1)Oc1ccc2cc(-c3ccc(-c4ccccc4)[nH]3)ccc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.