N-?Ethyl-?N-?[(heptadecafluorooct?yl)?sulfonyl]?-?glycine 1,?1-?Dimethylethyl Ester is an intermediate in synthesizing N-Ethyl-N-(perfluoro-1-octanesulfonyl) Glycine (E925518), in which it can be used in biological study for transformation and bioaccumulation of N-Et perfluorooctane sulfonamide ethanol (N-EtFOSE) in soil-earthworm system.