Using CC(C)(C)OC(=O)N1Cc2[nH]c3cc(Br)ccc3c2CC1(C)C, CI to produce Cn1c2c(c3ccc(Br)cc31)CC(C)(C)N(C(=O)OC(C)(C)C)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.