pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.94	IUPAC digitized pKa	-1	-2	O=C([O-])c1[nH]c(=O)[nH]c(=O)c1[N+](=O)[O-]	O=C([O-])c1[n-]c(=O)[nH]c(=O)c1[N+](=O)[O-],O=C([O-])c1[nH]c(=O)[n-]c(=O)c1[N+](=O)[O-]	mol9341	O=C(O)c1[nH]c(=O)[nH]c(=O)c1[N+](=O)[O-]