Using CCOC(=O)/C(=N\O)c1csc(N)n1, CC(C)(C)OC(=O)C(C)(C)Br to produce CCOC(=O)/C(=N\OC(C)(C)C(=O)OC(C)(C)C)c1csc(N)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.