pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.54	OCHEM	0	-1	NC(=O)CCC(=O)O	NC(=O)CCC(=O)[O-]	mol22216	NC(=O)CCC(=O)O
4.53999996185303	QSARToolbox	0	-1	NC(=O)CCC(=O)O	NC(=O)CCC(=O)[O-]	mol22216	NC(=O)CCC(=O)O