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Metyrapone from China

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 — China → United States

100%

Rate breakdown

9903.04.6093.5%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

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