pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
3.2	IUPAC digitized pKa	0	-1	CCC(C(=O)O)=C(C)C(=O)O	CCC(C(=O)[O-])=C(C)C(=O)O,CCC(C(=O)O)=C(C)C(=O)[O-]	mol9991	CCC(C(=O)O)=C(C)C(=O)O
6.1	IUPAC digitized pKa	-1	-2	CCC(C(=O)[O-])=C(C)C(=O)O,CCC(C(=O)O)=C(C)C(=O)[O-]	CCC(C(=O)[O-])=C(C)C(=O)[O-]	mol9991	CCC(C(=O)O)=C(C)C(=O)O