0 0 0 0 0 2920.90 Esters of other inorganic acids of non-metals and their salts; their halogenated, sulphonated, nitrated or nitrosated derivatives (excl. esters of hydrogen halides, and thiophosphoric esters ‘phosphorothioates’, their salts and their halogenated, sulphonaed, nitrated or nitrosated derivatives) 5 4