pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.1	IUPAC digitized pKa	0	-1	O=C(O)c1csccc1=O	O=C([O-])c1csccc1=O	mol9625	O=C(O)c1csccc1=O