Section 06 Products of the chemical or allied industries 29 Organic chemicals 29 18 Carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives. 29 18 21 Salicylic acid and its salts 29 18 21 00 Salicylic acid and its salts Commodity Code Description 29 18 21 00 000 Salicylic acid and its salts