pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
3.97000002861023	QSARToolbox	0	-1	O=c1c2ccccc2nnn1O	O=c1c2ccccc2nnn1[O-]	mol31415	O=c1c2ccccc2nnn1O