pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
3.22	IUPAC digitized pKa	0	-1	O=C(O)c1c[nH]nn1	O=C([O-])c1c[nH]nn1	mol9003	O=C(O)c1c[nH]nn1
8.73	IUPAC digitized pKa	-1	-2	O=C([O-])c1c[nH]nn1	O=C([O-])c1c[n-]nn1	mol9003	O=C(O)c1c[nH]nn1