pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.2	IUPAC digitized pKa	1	0	Cn1c[nH+]c2ncnc(N)c21,Cn1cnc2nc[nH+]c(N)c21,Cn1cnc2[nH+]cnc(N)c21,Cn1cnc2ncnc([NH3+])c21	Cn1cnc2ncnc(N)c21	mol8261	Cn1cnc2ncnc(N)c21