pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
2.54	IUPAC digitized pKa	0	-1	CCCC(O)(C(=O)O)C(=O)O	CCCC(O)(C(=O)[O-])C(=O)O	mol9588	CCCC(O)(C(=O)O)C(=O)O
4.64	IUPAC digitized pKa	-1	-2	CCCC(O)(C(=O)[O-])C(=O)O	CCCC(O)(C(=O)[O-])C(=O)[O-]	mol9588	CCCC(O)(C(=O)O)C(=O)O