Using O, Cc1cc(-c2c(Cl)c(=O)c2=O)c2c(C)ccc(C(C)C)cc1-2 to produce Cc1cc(-c2c(O)c(=O)c2=O)c2c(C)ccc(C(C)C)cc1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.