Using C#Cc1ccc2c(c1)[C@H](NC(=O)OC(C)C)C[C@H](C)N2C(C)=O, COC(=O)CN=[N+]=[N-] to produce COC(=O)Cn1cc(-c2ccc3c(c2)[C@H](NC(=O)OC(C)C)C[C@H](C)N3C(C)=O)nn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.