One way to do this identification is by using known reactions, such as those contained within the "transformations" section in PubChem, which links parent compounds to TPs with basic reaction information . Of all the substances on the five suspect lists mentioned above, perfluorooctanoic acid (PFOA) has the highest number of recorded parent compounds in the PubChem transformations section (from version 0.1.6 of the dataset archived on Zenodo) . This is also one of several PMT/vPvM TPs where parent compounds are included in the legislation as part of the substance group. Specifically, the Stockholm Convention restricts the use of PFOArelated compounds, which include compounds that form PFOA after degradation . TFA is also a known TP of several different compounds containing a CF3-moiety. Since there are over 5 million compounds containing a CF3-moiety included in PubChem [125], many of which are also industrially relevant, there are myriad potential sources of TFA.