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