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 Commodity Code Description 29 37 11 - - Somatotropin, its derivatives and structural analogues. 29 37 12 - - Insulin and its salts. 29 37 19 - - Other 29 37 21 - - Cortisone, hydrocortisone, prednisone (dehydrohydrocortisone) and prednisolone (dehydrocortisone) 29 37 22 - - Halogenated derivatives of corticosteroidal hormones 29 37 23 - - Oestrogens and progestogens 29 37 29 - - Other 29 37 50 - Prostaglandins, thromboxanes and leukotrienes, their derivatives and structural analogues 29 37 90 - Other