Protocatechuic Acid
Protocatechuic acid (3,4-dihydroxybenzoic acid) features adjacent hydroxyl groups ortho to each other on the benzene ring. Included in HTS 2028.19.20.00 per U.S. note 3 as aromatic carboxylic acid with alcohol function. Used in antioxidants and biochemical research.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If acyclic saturated analog
Non-aromatic versions are saturated acyclic monocarboxylic acids.
If diagnostic reagent preparation
Diagnostic or laboratory reagents containing these acids go to heading 3822.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Catechol structure (ortho-dihydroxy); distinguish from resorcinol types
• Often plant-derived; provide extraction method to avoid natural product reclassification
• Research chemical imports need end-user statements for DEA watchlist monitoring
Related Products under HTS 2918.19.20.00
Salicylic Acid USP
Salicylic acid is an aromatic carboxylic acid with a hydroxyl group (-OH) on the benzene ring, classifying it as a carboxylic acid with alcohol function but without other oxygen functions. It falls under HTS 2918.19.20.00 as a product described in additional U.S. note 3 to section VI for this specific aromatic compound. Used primarily in pharmaceuticals and cosmetics for its keratolytic properties.
Mandelic Acid
Mandelic acid (alpha-hydroxyphenylacetic acid) is an aromatic alpha-hydroxy acid with both carboxylic acid and alcohol functions on adjacent carbons. It qualifies under HTS 2918.19.20.00 per additional U.S. note 3 to section VI for these specific compounds. Commonly used in skincare for exfoliation and in pharmaceuticals as an antibacterial agent.
4-Hydroxybenzoic Acid
4-Hydroxybenzoic acid is a phenolic carboxylic acid with the hydroxyl group para to the carboxyl group on the benzene ring. Classified under HTS 2918.19.20.00 as specified in additional U.S. note 3 to section VI. Used as a preservative (paraben precursor) and in polymer production.
Vanillic Acid
Vanillic acid (4-hydroxy-3-methoxybenzoic acid) features both phenolic hydroxyl and methoxy groups on aromatic ring. Falls under HTS 2918.19.20.00 per U.S. note 3 as aromatic carboxylic acid with alcohol function. Natural flavor precursor used in food and fragrance industries.
Gallic Acid
Gallic acid (3,4,5-trihydroxybenzoic acid) contains three hydroxyl groups on the aromatic ring. Specifically included in HTS 2918.19.20.00 under additional U.S. note 3 to section VI. Used in inks, tanning agents, and as antioxidant in pharmaceuticals.
Gentisic Acid
Gentisic acid (2,5-dihydroxybenzoic acid) is an aromatic dihydroxybenzoic acid used as pharmaceutical intermediate and analytical reagent. Classified in HTS 2918.19.20.00 as specified by additional U.S. note 3 for these compounds. Known for analgesic and anti-inflammatory properties.