Using BrBr, CC(C)(C)OC(=O)N1CCC(C(C)(O)c2nccs2)CC1 to produce CC(C)(C)OC(=O)N1CCC(C(C)(O)c2ncc(Br)s2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.