pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
-2.13	IUPAC digitized pKa	1	0	O=[N+]([O-])c1cccc[n+]1O	O=[N+]([O-])c1cccc[n+]1[O-]	mol6612	O=[N+]([O-])c1cccc[n+]1[O-]