pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
4.21	IUPAC digitized pKa	1	0	CNc1[nH+]cn(C)c1C(=O)OC,C[NH2+]c1ncn(C)c1C(=O)OC	CNc1ncn(C)c1C(=O)OC	mol6680	CNc1ncn(C)c1C(=O)OC