71463-80-4 N-Ethyl-1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-heptadecafluoro-N-(3-(diethoxyphosphinyl)propyl)-1-octanesulfonamide Phosphonic acid, (3-(ethyl((heptadecafluorooctyl)sulfonyl)amino)propyl)-, diethyl ester