Tryptophan
L-Tryptophan is an essential amino acid featuring an indole side chain attached to alanine, classified under HTS 2933.99.0500 due to its indole structure. The heterocyclic nitrogen compound takes precedence over amino acid classification.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified as amino acid without heterocycle emphasis
Amino acids with oxygen function could shift if indole not considered defining feature.
If in animal feed preparations
Feed grade amino acid mixtures classified as preparations in Chapter 23.
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Import Tips & Compliance
• Indole amino acids classified here, not with other amino acids, per heterocyclic precedence
• Pharma grade requires USP certificate; feed grade may have different documentation
• Avoid Chapter 29 note 3(C) salt classification issues with pure free acid form
Related Products under HTS 2933.99.05.00
Acridine
Acridine is a heterocyclic aromatic compound with a nitrogen hetero-atom in its tricyclic structure, classified under HTS 2933.99.0500 as a specific aromatic heterocyclic compound. It serves as a fundamental building block in organic synthesis for pharmaceuticals and dyes.
Indole
Indole is a bicyclic aromatic heterocyclic compound featuring a benzene ring fused to a pyrrole ring with nitrogen hetero-atom, specifically named in HTS 2933.99.0500. It is widely used as an intermediate in synthesizing pharmaceuticals, perfumes, and agrochemicals.
1-Methylindole
1-Methylindole is a modified aromatic indole derivative with a methyl group at the nitrogen position, falling under HTS 2933.99.0500 as a named aromatic heterocycle modification. Commonly used in organic synthesis for pharmaceuticals and as a fragrance intermediate.
9-Aminoacridine
9-Aminoacridine is an acridine derivative with an amino group at position 9, classified under HTS 2933.99.0500 due to its core acridine structure despite additional nitrogen functionality. Used in pharmaceutical intermediates and as a fluorescent dye base.
Indole-3-Carboxaldehyde
Indole-3-carboxaldehyde features an aldehyde group at position 3 of the indole ring, remaining under HTS 2933.99.0500 as the named heterocyclic compound prevails over aldehyde function. Used in synthesis of pharmaceuticals and fragrances.
3-Acetylindole
3-Acetylindole contains a ketone functionality at position 3 of the indole structure, classified under HTS 2933.99.0500 with the heterocycle taking precedence over ketone classification. Important intermediate for alkaloid synthesis.