Using CCc1cc(OCc2ccc(-c3ccccc3C(=O)OC)cc2)c2ccccc2n1 to produce CCc1cc(OCc2ccc(-c3ccccc3C(=O)O)cc2)c2ccccc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.