dl-Tryptophan
The synthetic racemic form of the essential amino acid tryptophan, explicitly listed under HTS 2933.99.1200 as an aromatic nitrogen heterocyclic compound. Used in nutritional supplements, animal feed, and pharmaceutical intermediates. Its indole ring structure qualifies it for this specific subcategory.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If L-tryptophan (natural enantiomer) for human consumption
Specific amino acid provisions in 2922.50 override Chapter 29 heterocyclic classification.
If premixed in animal feed preparations
Feed preparations containing amino acids classified by function in Chapter 23.
If chemically modified tryptophan derivatives
Unlisted derivatives fall into residual heterocyclic category.
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Import Tips & Compliance
• FDA prior notice required for food/feed grade tryptophan shipments
• Certificate of Analysis must specify optical rotation confirming dl-form
• Heavy metal and microbial testing documentation prevents FDA holds
Related Products under HTS 2933.99.12.00
6-Bromo-5-methyl-1H-imidazo[4,5-b]pyridine
This is a specific aromatic heterocyclic compound containing nitrogen hetero-atoms only, explicitly listed in HTS 2933.99.1200. It is used as a pharmaceutical intermediate in the synthesis of antiviral and anticancer drugs. Its fused imidazole-pyridine ring structure qualifies it for classification under this subcategory of Chapter 29.
2,4-Di-tert-butyl-6-(benzotriazol-2-yl)phenol
A specific benzotriazole UV stabilizer explicitly named in HTS 2933.99.1200, featuring aromatic nitrogen heterocycles. Used in plastics, coatings, and adhesives to prevent UV degradation. The phenolic structure with fused triazole ring places it in this exact subcategory.
2-Phenylbenzimidazole
A specific aromatic imidazole derivative explicitly listed in HTS 2933.99.1200, containing only nitrogen hetero-atoms. Used as a UV absorber in cosmetics, plastics, and pharmaceuticals. The fused benzene-imidazole structure determines its precise classification.
Tetramethylpyrazine
A specific pyrazine derivative explicitly listed under HTS 2933.99.1200, featuring a six-membered aromatic nitrogen heterocycle. Used as a flavoring agent in food and in pharmaceutical formulations for circulatory disorders. Its precise chemical structure matches the tariff nomenclature.
Vinylcarbazole Monomer
N-Vinylcarbazole monomer, explicitly listed in HTS 2933.99.1200 as an aromatic nitrogen heterocyclic compound. Polymerized to form polyvinylcarbazole used in photoreceptors, electronics, and optical applications. The carbazole ring with vinyl group determines classification.
2-Methylmercaptobenzimidazole
A specific benzimidazole derivative with organo-sulfur functionality, explicitly listed in HTS 2933.99.1200. Used as rubber vulcanization accelerator and corrosion inhibitor. Classified here rather than organo-sulfur heading 2930 per chapter notes.