pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
2.68	IUPAC digitized pKa	0	-1	O=C(O)c1ccc([N+](=O)[O-])s1	O=C([O-])c1ccc([N+](=O)[O-])s1	mol9481	O=C(O)c1ccc([N+](=O)[O-])s1
2.6800001	OCHEM	0	-1	O=C(O)c1ccc([N+](=O)[O-])s1	O=C([O-])c1ccc([N+](=O)[O-])s1	mol9481	O=C(O)c1ccc([N+](=O)[O-])s1
2.6800000667572	QSARToolbox	0	-1	O=C(O)c1ccc([N+](=O)[O-])s1	O=C([O-])c1ccc([N+](=O)[O-])s1	mol9481	O=C(O)c1ccc([N+](=O)[O-])s1