pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
2.26	IUPAC digitized pKa	0	-1	O=C(O)CO[N+](=O)[O-]	O=C([O-])CO[N+](=O)[O-]	mol8940	O=C(O)CO[N+](=O)[O-]
2.25999999046326	QSARToolbox	0	-1	O=C(O)CO[N+](=O)[O-]	O=C([O-])CO[N+](=O)[O-]	mol8940	O=C(O)CO[N+](=O)[O-]