pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
2.58	IUPAC digitized pKa	0	-1	O=C(O)/C=C/[N+](=O)[O-]	O=C([O-])/C=C/[N+](=O)[O-]	mol9010	O=C(O)/C=C/[N+](=O)[O-]