pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
2.29	IUPAC digitized pKa	0	-1	O=C(O)c1cnc(C(=O)O)cn1	O=C([O-])c1cnc(C(=O)O)cn1	mol9626	O=C(O)c1cnc(C(=O)O)cn1