pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
13.2	IUPAC digitized pKa	0	-1	NC(=O)NC(N)=O	NC(=O)[N-]C(N)=O	mol5774	NC(=O)NC(N)=O
13.1999998092651	QSARToolbox	0	-1	NC(=O)NC(N)=O	NC(=O)[N-]C(N)=O	mol5774	NC(=O)NC(N)=O