Using OCCC(c1ccccc1)c1ccccc1, O=c1[nH]c2c([nH]c1=O)C(O)c1ccccc1-2 to produce O=c1[nH]c2c([nH]c1=O)C(OCCC(c1ccccc1)c1ccccc1)c1ccccc1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.