Using COC(=O)Cc1cc(C(=O)c2ccc3cc(-c4ccccc4)[nH]c3c2)sc1-c1ccccc1 to produce O=C(O)Cc1cc(C(=O)c2ccc3cc(-c4ccccc4)[nH]c3c2)sc1-c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.