Using O=CC1c2cc(CCCC(=O)O)ccc2-c2c(C(=O)O)cccc21 to produce O=C(O)CCCc1ccc2c(c1)C(CO)c1cccc(C(=O)O)c1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.