Sulphonated, nitrated or nitrosated derivatives of hydrocarbons; whether or not halogenated

290410 Derivatives of hydrocarbons; containing only sulpho groups, their salts and ethyl esters, whether or not halogenated 290420 Derivatives of hydrocarbons; containing only nitro or only nitroso groups, whether or not halogenated 290431 Derivatives of hydrocarbons; perfluorooctane sulphonic acid, whether or not halogenated 290432 Derivatives of hydrocarbons; ammonium perfluorooctane sulphonate, whether or not halogenated 290433 Derivatives of hydrocarbons; lithium perfluorooctane sulphonate, whether or not halogenated 290434 Derivatives of hydrocarbons; potassium perfluorooctane sulphonate, whether or not halogenated 290435 Derivatives of hydrocarbons; salts of perfluorooctane sulphonic acid n.e.c in heading no. 2904, whether or not halogenated 290436 Derivatives of hydrocarbons; perfluorooctane sulphonyl fluoride, whether or not halogenated 290491 Derivatives of hydrocarbons; trichloronitromethane (chloropicrin), whether or not halogenated 290499 Derivatives of hydrocarbons n.e.c. in heading no. 2904, whether or not halogenated