Using COC(=O)C1(CO)CCc2cc(C(=O)c3ccccc3)c(O)cc21 to produce O=C(c1ccccc1)c1cc2c(cc1O)C(CO)(C(=O)O)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.