Using CC1(C)C(=O)Nc2cc(N)c(N)cc21, O=C(O)CCC(=O)O to produce CC1(C)C(=O)Nc2cc3[nH]c(CCC(=O)O)nc3cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.