2.4.3. Step III: structure assignment and confirmation
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 the remaining components, annotated as potential TPs, their chro-matographic 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 fordetails).
Commercially available reference standards were purchased forthe tentatively identified TPs. Mass spectra were recorded with flow injection (concentration: 1000 ng mL−1in MeOH), and a series of calibration standards (concentration range: 5–200 ng mL−1) were analyzed to confirm RT.
2.4.3. Step III: structure assignment and confirmation
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 the remaining components, annotated as potential TPs, their chro-matographic 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 fordetails).
Commercially available reference standards were purchased forthe tentatively identified TPs. Mass spectra were recorded with flow injection (concentration: 1000 ng mL−1in MeOH), and a series of calibration standards (concentration range: 5–200 ng mL−1) were analyzed to confirm RT.
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