pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
2.5	IUPAC digitized pKa	0	-1	O=[N+]([O-])c1cc([N+](=O)[O-])c2cn[nH]c2c1O	O=[N+]([O-])c1cc([N+](=O)[O-])c2cn[nH]c2c1[O-]	mol10048	O=[N+]([O-])c1cc([N+](=O)[O-])c2cn[nH]c2c1O