pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
6.59	IUPAC digitized pKa	0	-1	O=c1ncnc2[nH]ncnc1-2	O=c1ncnc2[n-]ncnc1-2	mol9340	O=c1ncnc2[nH]ncnc1-2