Using O=C(O)c1ccc(Br)cc1, CC(C)(C)OC(=O)C(C)(C)Sc1nc(CN)cs1 to produce CC(C)(C)OC(=O)C(C)(C)Sc1nc(CNC(=O)c2ccc(Br)cc2)cs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.