Using CC(C)(C)OC(=O)N[C@@H](CSSC(C)(C)C)C(=O)O, N#CCBr to produce CC(C)(C)OC(=O)N[C@@H](CSSC(C)(C)C)C(=O)OCC#N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.