pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
2.09	IUPAC digitized pKa	1	0	CNc1ncc[nH+]c1C(N)=O,C[NH2+]c1nccnc1C(N)=O,CNc1[nH+]ccnc1C(N)=O	CNc1nccnc1C(N)=O	mol3981	CNc1nccnc1C(N)=O