pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
3.29	IUPAC digitized pKa	0	-1	O=C(O)C(O)(CO)CO	O=C([O-])C(O)(CO)CO	mol9137	O=C(O)C(O)(CO)CO