pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
-0.47	IUPAC digitized pKa	1	0	Cn1n[nH+]cc1Br,Cn1[nH+]ncc1Br	Cn1nncc1Br	mol7649	Cn1nncc1Br