3-Amino-3-methyl-1-butyne Pharmaceutical Grade from China
High-purity 3-Amino-3-methyl-1-butyne meeting pharmaceutical standards, explicitly covered under HTS 2921.19.31.00 as a named acyclic monoamine. Used in synthesis of antiviral drugs and as a building block for alkyne-containing therapeutics. Purity >99% distinguishes it for regulated import.
Duty Rate — China → United States
37.5%
Rate breakdown
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Include GMP or USP certificate to support pharma end-use and prevent scrutiny under general chemical headings
• Label with exact CAS number and batch purity to match HTS specific naming requirements
• Pre-register under TSCA if new importer; pharma intermediates often trigger EPA review