Using COc1ccc(Cn2cc3c(c2Cl)c(=O)n(C)c(=O)n3CC(C)C)cc1 to produce CC(C)Cn1c(=O)n(C)c(=O)c2c(Cl)[nH]cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.