Using CCOC(=O)CC1(C(=O)OCC)Cn2c(cc3ccccc32)C1=O to produce CCOC(=O)CC1(C(=O)OCC)Cn2c(cc3ccccc32)C1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.