HTS Code 2937.90 - Hormones, natural or reproduced by synthesis; derivatives and structural analogues thereof, used primarily as hormones (excluding polypeptide hormones, protein hormones, glycoprotein hormones, steroidal hormones, catecholamine hormones, prostaglandins, thromboxanes and leukotrienes, their derivatives and structural analogues, and amino-acid derivatives, and products of 3002 10)