Diflufenican is an analytical reference material in ROTICHROM® Pestilyse® HPLC grade, intended for chromatographic and environmental residue work. It is identified by CAS number 83164-33-4 and EG number 617-446-2, with the empirical formula C₁₉H₁₁F₅N₂O₂, a molar mass of 394,29 g/mol and a density of 1,4 g/cm³. Supplied as a 100 mg portion in glass, the material supports method development, calibration and quality control where a defined pesticide-related standard is required. In gas chromatography and broader environmental analysis workflows, laboratories rely on consistent chemical identity and HPLC-oriented grade to underpin quantification and confirmation steps. This ROTICHROM® Pestilyse® HPLC preparation from manufacturer Carl ROTH fits residue-analysis protocols that demand traceable reference input without expanding beyond the stated specification. The compact glass pack is practical for standard preparation and routine analytical use in chromatography-focused laboratories handling environmental samples. This article is part of Chromatography standards (GC, HPLC, pesticides), in Analytical standards & reference materials. Key features Assay: ≥99.5 % CAS number: 83164-33-4 Pack size: 100 mg glass EG nr.: 617-446-2 Empirical formula: C₁₉H₁₁F₅N₂O₂ Molar mass: 394,29 g/mol Technical Information Sheet: Safety Data Sheet: