pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.2	Organic Oxygen Acids and Nitrogen Bases	0	-1	NC(=O)CNc1ccccc1C(=O)O	NC(=O)CNc1ccccc1C(=O)[O-]	mol21737	NC(=O)CNc1ccccc1C(=O)O