Other
Oxygen-function amino-compounds: > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof: > Other: > Aromatic: > Other: > Other: > Other
Duty Rate (from China)
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Products classified under HTS 2922.49.37.00
DL-Phenylalanine
DL-Phenylalanine is an aromatic amino acid containing a single carboxyl oxygen function, classified under HTS 2922.49.37.00 as an oxygen-function amino-compound that is neither a proteinogenic amino acid nor a drug. It is used as a nutritional supplement and in pharmaceutical intermediates. The code covers other aromatic amino acids and their simple derivatives not specified elsewhere.
DL-Tyrosine
DL-Tyrosine is a synthetic aromatic amino acid with phenolic oxygen function, falling under HTS 2922.49.37.00 as 'other' oxygen-function amino-compounds. Despite its phenolic group, it qualifies due to single carboxyl classification and exclusion from proteinogenic listings. Commonly used in nootropic supplements and biochemical research.
4-Fluorophenylalanine
4-Fluorophenylalanine is a halogenated aromatic amino acid used in PET imaging tracers and protein engineering, falling under HTS 2922.49.37.00. The fluorine substitution doesn't alter its oxygen-function amino-acid classification per chapter note 4. Qualifies as chemically defined compound of note (a).
Benzyl Glycine
Benzyl glycine (2-amino-3-phenylpropanoic acid variant) is an aromatic-substituted glycine classified under HTS 2922.49.37.00 as other aromatic oxygen-function amino-compound. Single carboxyl function qualifies it for this heading. Used in custom peptide production.
3-Nitrophenylalanine
3-Nitrophenylalanine is a nitro-substituted aromatic amino acid used in photocaging groups for photochemistry, classified HTS 2922.49.37.00. Nitro group doesn't count as nitrogen-function for 2929 per chapter note 4. Single oxygen-function carboxyl defines classification.
D-Phenylalaninol
D-Phenylalaninol is the amino-alcohol reduction product of phenylalanine, classified under HTS 2922.49.37.00 as oxygen-function amino-compound (alcohol oxygen). Retains amino-acid carbon skeleton recognition. Used in chiral ligand synthesis.
Tyrosine Ethyl Ester
Tyrosine ethyl ester follows parent tyrosine classification per note 3(B) in HTS 2922.49.37.00. Ethyl esters of Chapter 29 acids stay with acid heading. Protected form for peptide synthesis.
Phenylglycine
Phenylglycine (alpha-amino-phenylacetic acid) is an aromatic amino acid used as intermediate in antibiotic synthesis, classified in HTS 2922.49.37.00 as other aromatic oxygen-function amino-compounds. It features a single carboxyl group and phenyl substitution on the alpha-carbon. Meets Chapter 29 note (a) for separate chemically defined organic compounds.
DL-Homophenylalanine
DL-Homophenylalanine is a phenylalanine homolog with extended carbon chain, classified under HTS 2922.49.37.00 as an other aromatic amino-acid. The single oxygen-function carboxyl group qualifies it for this oxygen-function amino-compound heading. Used in peptide synthesis and pharmaceutical research.
Phenylalanine Methyl Ester Hydrochloride
Phenylalanine methyl ester hydrochloride is the ester salt of phenylalanine, classified in HTS 2922.49.37.00 per note 3(A) with the parent amino-acid. The ester maintains the oxygen-function amino-compound nature. Used as protected amino acid in solid-phase peptide synthesis.