pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
-0.62	IUPAC digitized pKa	1	0	C[NH2+]c1ccccc1[N+](=O)[O-]	CNc1ccccc1[N+](=O)[O-]	mol2218	CNc1ccccc1[N+](=O)[O-]
-0.492	AttenGpKa training set	1	0	C[NH2+]c1ccccc1[N+](=O)[O-]	CNc1ccccc1[N+](=O)[O-]	mol2218	CNc1ccccc1[N+](=O)[O-]