Propylthiouracil Crystals from Canada
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 — Canada → United States
100%
Rate breakdown
9903.04.6096.3%Pharmaceuticals: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Thione tautomer confirmation via spectroscopy for classification
• Endocrine disruptor handling protocols required
• Crystalline vs amorphous form specs impact purity declaration