Using Brc1csc(Br)n1, CC(C)(C)OC(=O)N1CCC(=O)CC1 to produce CC(C)(C)OC(=O)N1CCC(O)(c2nc(Br)cs2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.