Using O=C(O)c1cc(Nc2ccccc2)c(C(=O)O)cc1Nc1ccccc1 to produce O=c1c2ccccc2[nH]c2cc3c(=O)c4ccccc4[nH]c3cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.