Using COc1c(C)cc(C2(O)C(=O)N(Cc3ccccc3Cl)c3ccccc32)cc1C to produce COc1c(C)cc(C2C(=O)N(Cc3ccccc3Cl)c3ccccc32)cc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.