pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
8.9	IUPAC digitized pKa	0	-1	C/C=C/C(=O)NO	C/C=C/C(=O)N[O-]	mol9209	C/C=C/C(=O)NO