pka_value	data_source	charge_state_pre	charge_state_post	microspecies_pre	microspecies_post	molid	smiles
2.13	IUPAC digitized pKa	0	-1	CCCS[P@](=O)(O)CC	C[CH-][P@@](=O)(O)SCCC	mol9519	CCCSP(=O)(O)CC
2.13000011444092	QSARToolbox	0	-1	CCCS[P@](=O)(O)CC	C[CH-][P@@](=O)(O)SCCC	mol9519	CCCSP(=O)(O)CC