pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
2.95	IUPAC digitized pKa	0	-1	O=c1[nH][nH]c(=O)c(=O)[nH]1	O=c1[n-]c(=O)c(=O)[nH][nH]1,O=c1[nH][n-]c(=O)c(=O)[nH]1,O=c1[n-][nH]c(=O)c(=O)[nH]1	mol9009	O=c1[nH][nH]c(=O)c(=O)[nH]1