UM-PPS was used without the “relative reasoning mode” [16]to predict two generations of TPs for each pharmaceutical. This list was complemented with TPs previously described in literature[10,17–31,33–36,39]. The candidates retained from step II were compared to this list on the basis of their exact mass, and – in case of a match – were annotated as tentatively identified TPs. For there maining components, annotated as potential TPs, their chromatographic and spectral information as well as time-trends were manually inspected and the most plausible molecular
formula was assigned to each component (see Supplementary Material for details).