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Propylthiouracil Crystals from China

Propylthiouracil features pyrimidine-2-thione structure for thyroid treatment. Classifies HTS 2933.59.59.00 as pyrimidine drug; sulfur directly linked but nitrogen ring principal. Used in hyperthyroidism therapy.

Duty Rate — China → United States

16.2%

Rate breakdown

9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China

Import Tips

Thione tautomer confirmation via spectroscopy for classification

Endocrine disruptor handling protocols required

Crystalline vs amorphous form specs impact purity declaration