Section 06 Products of the chemical or allied 29 Organic chemicals 29 37 Hormones, prostaglandins, thromboxanes and leukotrienes, natural or reproduced by synthesis; derivatives and structural analogues thereof, including chain modified polypeptides, used primarily as hormones 29 37 12 - - Insulin and its salts. Commodity Code Description 29 37 12 00 - - Insulin and its salts.