pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
6.5	IUPAC digitized pKa	-1	-2	O=C1C(=NO)C=C(S(=O)(=O)[O-])c2ccccc21	O=C1C(=N[O-])C=C(S(=O)(=O)[O-])c2ccccc21	mol11439	O=C1C(=NO)C=C(S(=O)(=O)O)c2ccccc21