pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.24	IUPAC digitized pKa	0	-1	O=[N+]([O-])C(CO)[N+](=O)[O-]	O=[N+]([O-])[C-](CO)[N+](=O)[O-]	mol8950	O=[N+]([O-])C(CO)[N+](=O)[O-]
4.28999996185303	QSARToolbox	0	-1	O=[N+]([O-])C(CO)[N+](=O)[O-]	O=[N+]([O-])[C-](CO)[N+](=O)[O-]	mol8950	O=[N+]([O-])C(CO)[N+](=O)[O-]
4.23999977111816	QSARToolbox	0	-1	O=[N+]([O-])C(CO)[N+](=O)[O-]	O=[N+]([O-])[C-](CO)[N+](=O)[O-]	mol8950	O=[N+]([O-])C(CO)[N+](=O)[O-]