Tasimelteon (CAS No. 609799-22-6) in bulk form. Tasimelteon is a selective agonist for the melatonin receptors MT1 and MT2. It is indicated for the treatment of non-24-hour sleep/wake disorder. You state SST will be importing about 100 grams of Tasimelteon for evaluation by U.S. Pharmaceutical companies to develop generic drug products.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N308704