In headings 2904 to 2906, 2908 to 2911 and 2913 to 2920, any reference to halogenated, sulphonated, nitrated or nitrosated derivatives includes a reference to compound derivatives, such as sulphohalogenated, nitrohalogenated, nitrosulphonated or nitrosulphohalogenated derivatives.
Nelle voci da 2904 a 2906, da 2908 a 2911, e da 2913 a 2920, ogni riferimento ai derivati alogenati, solfonati, nitrati o nitrosi è da ritenersi applicabile anche ai derivati misti, quali i solfoalogenati, i nitroalogenati, i nitrosolfonati e i nitrosolfoalogenati.