Using Cc1c(C=O)c2c(c(C)c1NC(=O)CC(C)(C)C)C(c1ccc(C(C)C)cc1)CO2 to produce Cc1c(CO)c2c(c(C)c1NC(=O)CC(C)(C)C)C(c1ccc(C(C)C)cc1)CO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.