Using [N-]=[N+]=[N-], COC1=CC(=O)c2c(C)cc(C)cc2C1=O to produce COc1cc(=O)c2c(C)cc(C)cc2[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.