Section 06 Products of the chemical or allied industries 29 Organic chemicals 29 16 Unsaturated acyclic and cyclic monocarboxylic acids, their anhydrides; ... derivatives 29 16 13 Methacrylic acid and its salts 29 16 13 00 Methacrylic acid and its salts Commodity Code Description 29 16 13 00 000 Methacrylic acid and its salts