pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
1.57	IUPAC digitized pKa	1	0	[NH3+]C1=CC(=O)C(=O)c2ccccc21	NC1=CC(=O)C(=O)c2ccccc21	mol5815	NC1=CC(=O)C(=O)c2ccccc21