Section 06 Products of the chemical or allied industries 29 Organic chemicals 29 04 Sulphonated, nitrated or nitrosated derivatives of hydrocarbons, whether or not halogenated. Commodity Code Description 29 04 10 derivatives containing only sulpho groups, their salts, and ethyl esters 29 04 20 derivatives containing only nitro/nitroso groups 29 04 31 Perfluorooctane sulphonic acid 29 04 32 Ammonium perfluorooctane sulphonate 29 04 33 Lithium perfluorooctane sulphonate 29 04 34 Potassium perfluorooctane sulphonate 29 04 35 Other salts of perfluorooctane sulphonic acid 29 04 36 Perfluorooctane sulphonyl fluoride 29 04 91 Trichloronitromethane (chloropicrin) 29 04 99 Other