pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
6.63	IUPAC digitized pKa	0	-1	Cc1nc(N)nc2[nH]nnc12	Cc1nc(N)nc2[n-]nnc12	mol8340	Cc1nc(N)nc2[nH]nnc12