pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
2.57	IUPAC digitized pKa	-1	-2	O=C([O-])C[N+](O)(CC(=O)[O-])CC(=O)O,O=C([O-])C[N+]([O-])(CC(=O)O)CC(=O)O	O=C([O-])C[N+](O)(CC(=O)[O-])CC(=O)[O-]	mol9779	O=C(O)C[N+]([O-])(CC(=O)O)CC(=O)O
7.89	IUPAC digitized pKa	-2	-3	O=C([O-])C[N+](O)(CC(=O)[O-])CC(=O)[O-]	O=C([O-])C[N+]([O-])(CC(=O)[O-])CC(=O)[O-]	mol9779	O=C(O)C[N+]([O-])(CC(=O)O)CC(=O)O