pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
2.3	IUPAC digitized pKa	0	-1	O=c1o[nH]c(-c2ccccc2)c1Br	O=c1o[n-]c(-c2ccccc2)c1Br	mol11111	O=c1o[nH]c(-c2ccccc2)c1Br