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Propylthiouracil Crystals from Mexico

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 — Mexico → United States

13.7%

Rate breakdown

9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico

Import Tips

Thione tautomer confirmation via spectroscopy for classification

Endocrine disruptor handling protocols required

Crystalline vs amorphous form specs impact purity declaration