0 0 0 0 2917.19 Acyclic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and their halogenated, sulphonated, nitrated or nitrosated derivatives (excl. oxalic acid, its salts and esters, adipic acid, its salts and esters, azelaic acid, sebacic acid, their salts and esters and maleic anhydride) 5 4 3