The samples for analysis were fluorinated pharmaceuticals consisting of fluorometholone, flutamide, sodium flurbiprofen (USP-Standard, Rockville, MD, USA), flumazenil, flunitrazepam (Hoffmann-La Roche, Grenzach-Wyhlen, Germany), fluvastatin sodium hydrate (Hemofarm, Vrsac, Serbia), fluprednidene acetate (Alcon-Pharma, Freiburg, Germany), fluphenazine dihydrochloride (from the former pharmaceutical company Byk-Gulden, Konstanz, Germany), fluoxetine hydrochloride (Teva, Ulm, Germany), fludarabine phosphate (CRS-standard from EDQM, Strasbourg, France),
flurazepam hydrochloride (Roche Diagnostics, Mannheim, Germany), flucytosine (Sigma-Aldrich, Taufkirchen, Germany), and fluconazole (Dr.