</>Build with Tariff Intelligence|Programmatic access to tariff calculations and HS code classification.Explore Developer Resources →

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

Cephamycin C Core Intermediate from China — Import Duty Rate | HTS 2934.99.70.00