pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
-1.3	OCHEM	0	-1	""	O=[N+]([O-])[O-]	mol21873	O=[N+]([O-])O
-1.5	QSARToolbox	0	-1	""	O=[N+]([O-])[O-]	mol21873	O=[N+]([O-])O
-1.46	AttenGpKa training set	0	-1	""	O=[N+]([O-])[O-]	mol21873	O=[N+]([O-])O