pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
7.15	IUPAC digitized pKa	0	-1	O=c1cnnc[nH]1	O=c1cnnc[n-]1	mol8999	O=c1cnnc[nH]1