pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.2	IUPAC digitized pKa	-1	-2	O=C([O-])CS(=O)(=O)O,O=C(O)CS(=O)(=O)[O-]	O=C([O-])CS(=O)(=O)[O-]	mol8951	O=C(O)CS(=O)(=O)O
4.07	IUPAC digitized pKa	-1	-2	O=C([O-])CS(=O)(=O)O,O=C(O)CS(=O)(=O)[O-]	O=C([O-])CS(=O)(=O)[O-]	mol8951	O=C(O)CS(=O)(=O)O
2.24000000953674	QSARToolbox	-1	-2	O=C([O-])CS(=O)(=O)O,O=C(O)CS(=O)(=O)[O-]	O=C([O-])CS(=O)(=O)[O-]	mol8951	O=C(O)CS(=O)(=O)O