Using [N-]=[N+]=NCCOCCOCCOCCN, C=CCOC(=O)[C@H](Cc1ccc(OC(=O)NCC[C@H](NC(=O)OC(C)(C)C)C(=O)O)cc1)NC(=O)OC(C)(C)C to produce C=CCOC(=O)[C@H](Cc1ccc(OC(=O)NCC[C@H](NC(=O)OC(C)(C)C)C(=O)NCCOCCOCCOCCN=[N+]=[N-])cc1)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.