Cephamycin C Core Intermediate from China
Synthetic cephamycin C nucleus structurally analogous to the named bicyclic beta-lactam in HTS 2934.99.70.00, used in broad-spectrum antibiotic production. Classified as 'other heterocyclic compounds' due to the characteristic 5-thia-1-azabicyclo[4.2.0]octene ring system.
Duty Rate — China → United States
12.5%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Stereochemistry critical - provide X-ray crystallography or NMR confirming beta-lactam ring integrity
• Controlled substance precursor monitoring may apply; maintain 3-year import records
• Beta-lactam allergens require specific worker safety documentation for US facilities