pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
1.9	OCHEM	0	-1	O=S(=O)(O)O	O=S(=O)([O-])O	mol21884	O=S(=O)(O)O
2.0	QSARToolbox	0	-1	O=S(=O)(O)O	O=S(=O)([O-])O	mol21884	O=S(=O)(O)O