N-Ethyl-N-(2-hydroxyethyl)perfluorooctylsulphonamide-d9, is the labeled analogue of N-Ethyl-N-(2-hydroxyethyl)perfluorooctylsulphonamide (E917650), a perfluorinated alkyl sulfonamide (PFAS) used in a variety of consumer products for surface protection. It is a pollutant found in the air.