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Thiazyl fluoride, NSF, is a colourless, pungent gas that is unstable at room temperature. Along with thiazyl trifluoride, NSF3, it is an important precursor to other sulfur-nitrogen-fluorine compounds.
References
Oskar Glemser and Rüdiger Mews (1980). "Chemistry of Thiazyl Fluoride (NSF) and Thiazyl Trifluoride (NSF3): A Quarter Century of Sulfur-Nitrogen-Fluorine Chemistry". Angew. Chem Int. Ed Engl.19 (11): 883–899. doi:10.1002/anie.198008831.