pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.0	AttenGpKa training set	0	-1	O=C(O)C/C=N/O	O=C([O-])C/C=N/O	mol22201	O=C(O)C/C=N/O