Using O=C1CCC(=O)N1Br, CC(C)(C)OC(=O)N1C[C@@H](c2ccc(N)nc2)C[C@H]1CO to produce CC(C)(C)OC(=O)N1C[C@@H](c2cnc(N)c(Br)c2)C[C@H]1CO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.