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Ultra performance liquid chromatography (UPLC) chromatograms of desulfo-GSLs standards (A) and kale sample extract (B). Peak identification 1: glucoiberin; 2: progoitrin; 3: epiprogoitrin; 4: glucoraphanin; 5: sinigrin; 6: glucoraphenin; 7: gluconapin; 8: glucobarbarin; 9: glucobrassicanapin; 10: glucoerucin; 11: glucobrassicin; and 12: gluconasturtiin.
