Section 06 Products of the chemical or allied 29 Organic chemicals 29 18 Carboxylic acids with oxygen function, etc, their...derivatives 29 18 15 Salts and esters of citric acid Commodity Code Description 29 18 15 00 Salts and esters of citric acid 29 18 15 10 Calcium citrate 29 18 15 90 Other