Using CCC1(CC(=O)OC)OCC(Cc2ccccc2)c2c1[nH]c1ccccc21 to produce CCC1(CC(=O)O)OCC(Cc2ccccc2)c2c1[nH]c1ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.