pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.91	IUPAC digitized pKa	-1	-2	O=C([O-])CCCS(=O)(=O)O,O=C(O)CCCS(=O)(=O)[O-]	O=C([O-])CCCS(=O)(=O)[O-]	mol9233	O=C(O)CCCS(=O)(=O)O