pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
7.31	IUPAC digitized pKa	-1	-2	O=Nc1c(O)ccc2ccc(S(=O)(=O)[O-])cc12	O=Nc1c([O-])ccc2ccc(S(=O)(=O)[O-])cc12	mol11444	O=Nc1c(O)ccc2ccc(S(=O)(=O)O)cc12