Using CC(C)(C)OC(=O)N[C@@H](CCNC(N)=S)C(=O)OC(C)(C)C, O=CC(Br)C=O to produce CC(C)(C)OC(=O)N[C@@H](CCNc1ncc(C=O)s1)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.