Methyprylon Synthesis Intermediate from Japan
High-purity methyprylon used as chemical intermediate in research synthesis of piperidinedione analogs. Qualifies under Chapter 29 as separate chemically defined heterocyclic nitrogen compound. Directly named in tariff subheading 2933.72.00.00.
Duty Rate — Japan → United States
15%
Rate breakdown
9903.04.6215%Pharmaceuticals: patented pharma from JP/EU/KR/CH/LI — 15% 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 intended synthesis pathway documentation to justify research chemical import
• Ensure temperature-controlled shipping (<25°C) to prevent degradation of heat-sensitive lactam
• Complete CBP Biotechnology Notice if genetically modified production strains were used