Using COC(=O)c1sc(Br)cc1NC(=O)NC1CCN(C(=O)OC(C)(C)C)CC1 to produce CC(C)(C)OC(=O)N1CCC(n2c(=O)[nH]c3cc(Br)sc3c2=O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.