pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.85	IUPAC digitized pKa	0	-1	CO/C=C/C(=O)O	CO/C=C/C(=O)[O-]	mol9129	CO/C=C/C(=O)O