pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
3.75	IUPAC digitized pKa	0	-1	C#C/C=C/C(=O)O	C#C/C=C/C(=O)[O-]	mol9302	C#C/C=C/C(=O)O