Using [N-]=[N+]=[N-], Cc1c(COc2cc(C#N)cc(OCC3CCOCC3)c2)[nH]ccc1=O to produce Cc1c(COc2cc(OCC3CCOCC3)cc(-c3nnn[nH]3)c2)[nH]c2ccccc2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.