pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
1.89	IUPAC digitized pKa	0	-1	CCCCC#CC#CC(=O)O	CCCCC#CC#CC(=O)[O-]	mol10870	CCCCC#CC#CC(=O)O
1.88999998569489	QSARToolbox	0	-1	CCCCC#CC#CC(=O)O	CCCCC#CC#CC(=O)[O-]	mol10870	CCCCC#CC#CC(=O)O