Using O=C1c2ccccc2C(=O)c2c1ccc(O)c2O, CC(=O)OC(C)=O to produce CC(=O)Oc1ccc2c(c1O)C(=O)c1ccccc1C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.