pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
7.28	IUPAC digitized pKa	0	-1	O=c1ccc2no[nH]c-2c1	O=c1ccc2no[n-]c-2c1	mol9617	O=c1ccc2no[nH]c-2c1