Section 06 Products of the chemical or allied industries 29 Organic chemicals 29 17 Polycarboxylic acids, their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives. 29 17 11 Oxalicacid, its salts and esters 29 17 11 00 Oxalicacid, its salts and esters Commodity Code Description 29 17 11 00 000 Oxalicacid, its salts and esters