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