Using Nc1nnn[nH]1, O=C(O)c1c[nH]c2c(=O)oc3ccccc3c2c1=O to produce O=C(Nc1nnn[nH]1)c1c[nH]c2c(=O)oc3ccccc3c2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.