Pentobarbital Free Acid Form from Mexico
Pentobarbital in its free acid form (non-salt) is explicitly covered under HTS 2933.53.00.00 as pentobarbital (INN). Used in synthesis of injectable formulations. Chemically pure heterocyclic compound per Chapter 29 scope.
Duty Rate — Mexico → United States
100%
Rate breakdown
9903.04.60100%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
• pH specification critical; free acid form (pH 4-6) vs salt (pH 9-11) affects processing
• Particle size distribution data prevents milling duty disputes at customs
• Avoid ethyl alcohol residues from synthesis per Chapter 29 exclusion note 2(b)