pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.12	IUPAC digitized pKa	0	-1	CCCC/C=C\C(=O)O	CCCC/C=C\C(=O)[O-]	mol10000	CCCC/C=C\C(=O)O