pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
-2.8	IUPAC digitized pKa	0	-1	COC(=O)C(C#N)C#N	COC(=O)[C-](C#N)C#N	mol9342	COC(=O)C(C#N)C#N