pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
5.6	IUPAC digitized pKa	-1	-2	O=[N+]([O-])c1ccccc1OP(=O)([O-])O	O=[N+]([O-])c1ccccc1OP(=O)([O-])[O-]	mol9901	O=[N+]([O-])c1ccccc1OP(=O)(O)O