pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.186666667	AttenGpKa training set	0	-1	NC(=O)N[N+](=O)[O-]	NC(=O)[N-][N+](=O)[O-]	mol27517	NC(=O)N[N+](=O)[O-]