HTS Code 2935.50 - Perfluorooctane sulphonamides (excl. N-Methylperfluorooctane sulphonamide, N-Ethylperfluorooctane sulphonamide, N-Ethyl-N-(2-hydroxyethyl) perfluorooctane sulphonamide and N-(2-Hydroxyethyl)-N-methylperfluorooctane sulphonamide)