pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.38	IUPAC digitized pKa	0	-1	O=C1CCC(C(=O)O)CC1	O=C1CCC(C(=O)[O-])CC1	mol9990	O=C1CCC(C(=O)O)CC1