Using O=CC1c2cc(C(=O)OCc3ccccc3)ccc2-c2ccc(C(=O)OCc3ccccc3)cc21 to produce O=CC1c2cc(C(=O)O)ccc2-c2ccc(C(=O)O)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.