Using COc1ccc2c(Cl)c(-c3ccc(NC(=O)OC(C)C)cc3)[nH]c2c1, BrCC1CC1 to produce COc1ccc2c(Cl)c(-c3ccc(NC(=O)OC(C)C)cc3)n(CC3CC3)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.