Section 06 Products of the chemical or allied 29 Organic chemicals 29 37 Hormones; derivatives thereof used as hormones; other steroids 29 37 50 Prostaglandins, thromboxanes and leukotrienes, their derivatives and structural 29 37 50 00 Prostaglandins, thromboxanes and leukotrienes, their derivatives and structural Commodity Code Description 29 37 50 00 00 Prostaglandins, thromboxanes and leukotrienes, their derivatives and structural