Metyrapone from Mexico
Metyrapone, containing a methyl 1-(2-pyridyl)-1-propanone structure, inhibits cortisol synthesis in Cushing's syndrome treatment. HTS 2933.39.41.00 applies for its pyridine ring as a drug per Chapter 29 heterocyclic rules. Pharmaceutical bulk powder for API synthesis.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Ketone functionality confirmation via IR spectroscopy supporting pyridine classification
• Specify diagnostic/therapeutic end-use to avoid research chemical reclassification
• Light-sensitive powder; transport in amber containers with stability data