Section 06 Products of the chemical or allied industries 29 Organic chemicals 29 18 Carboxylic acids with additional oxygen function and their ... derivatives 29 18 13 Salts and esters of tartaric acid 29 18 13 00 Salts and esters of tartaric acid Commodity Code Description 29 18 13 00 000 Salts and esters of tartaric acid