Tryptophan
L-Tryptophan is an essential amino acid featuring an indole side chain attached to the alanine backbone. It is classified under tariff item 2933.99.00 because the heterocyclic nitrogen compound takes precedence over the amino acid function. This compound is used in pharmaceutical, nutritional, and animal feed applications.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the amino acid function is considered the essential character
Chapter 29 Note 3 directs classification to the heading occurring last in numerical order when goods could be included in two or more headings.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide the CAS number (73-22-3) and purity certificate on the commercial invoice
• If the product is for animal feed, verify CFIA import requirements
• If for human consumption, ensure compliance with Health Canada regulations for natural health products
Related Products under Tariff item 2933.99.00
1,3,3-Trimethyl-2-Methyleneindoline
1,3,3-Trimethyl-2-methyleneindoline is an indoline derivative used as a key intermediate in the production of photochromic dyes and other specialty chemicals. As a heterocyclic compound with a nitrogen hetero-atom, it is classified under tariff item 2933.99.00.
1-Methylindole
1-Methylindole is a modified aromatic indole derivative with a methyl group at the nitrogen position, classified as a separate chemically defined organic compound with a nitrogen hetero-atom only. It falls under heading 29.33 as an 'other' heterocyclic compound. This compound is commonly used in organic synthesis for pharmaceutical and chemical applications.
2-Methylindole
2-Methylindole is a simple alkyl-substituted indole with methylation at position 2, classified as a separate chemically defined organic compound with a nitrogen hetero-atom only. It falls under heading 29.33 as an 'other' heterocyclic compound. This compound is used in perfume synthesis and as a pharmaceutical intermediate.
3-Acetylindole
3-Acetylindole contains a ketone functionality at position 3 of the indole structure, classified as a separate chemically defined organic compound with a nitrogen hetero-atom only. It falls under heading 29.33 as an 'other' heterocyclic compound, with the heterocycle taking precedence over the ketone classification. This compound is an important intermediate for alkaloid synthesis.
3-Aminocarbazole
3-Aminocarbazole is a carbazole derivative with an amino group substitution, maintaining the core heterocyclic nitrogen structure. It is used as an intermediate in pharmaceutical and dye synthesis and is classified under tariff item 2933.99.00.
4-Carbazoleboronic Acid
4-Carbazoleboronic acid retains the core carbazole heterocyclic structure with a boronic acid substitution. It is used as an intermediate in organic synthesis and is classified under tariff item 2933.99.00 as an organo-inorganic compound.