Using O=CC1c2cc(C(=O)O)ccc2-c2ccc(C(=O)O)cc21 to produce O=C(O)c1ccc2c(c1)C(CO)c1cc(C(=O)O)ccc1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.