Using Nc1ccccn1, CC(C)(C)OC(=O)N[C@H](C(=O)O)C(C)(C)C to produce CC(C)(C)[C@H](N)C(=O)Nc1ccccn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.