Using Nc1cc(Oc2ccc3[nH]ccc3c2)ccn1, O=C=Nc1ccccc1 to produce Nc1cc(Oc2ccc3c(ccn3C(=O)Nc3ccccc3)c2)ccn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.