Using COC(=O)COc1cc2c(c(Cl)c1C)C(=O)C1(CCCC1)C2=O to produce Cc1c(OCC(=O)O)cc2c(c1Cl)C(=O)C1(CCCC1)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.