pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.36	IUPAC digitized pKa	0	-1	COc1cc(/C=C/C(=O)O)cc(OC)c1	COc1cc(/C=C/C(=O)[O-])cc(OC)c1	mol11517	COc1cc(/C=C/C(=O)O)cc(OC)c1