Bulk Trimethoprim Base Crystals from China
Pure trimethoprim free base in crystalline form for pharmaceutical compounding, under HTS 2933.59.22.00 as aromatic anti-infective. Used in custom antibiotic suspensions and tablets. Chemically defined pyrimidine compound meeting chapter purity standards.
Duty Rate — China → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals Annex IV: 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
• Provide polymorphic form certificate (Form I most common) for IP validation
• Ensure <0.5% water content to prevent hydrate formation reclassification
• Declare crystal habit (prismatic) which affects tableting and potential dosage form shifts