Nordihydroguaiaretic Acid (NDGA)
NDGA is a potent antioxidant polyphenol from creosote bush used in food preservation and pharmaceuticals. HTS 2907.29.90.00 covers this tetraphenolic lignan as 'other' polyphenol. Synthetic versions also commercially available.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified as saturated acyclic oxygen function
Aliphatic chain structure may classify under different oxygen function headings.
If antioxidant additive blend
Commercial antioxidant preparations containing NDGA classify as mixtures.
If crude plant material containing NDGA
Medicinal plants containing antioxidant principles classify under Chapter 12.
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Import Tips & Compliance
• Include prior sanction letters for food additive use
• Specify natural vs synthetic origin
• Document peroxide value for antioxidant efficacy
Related Products under HTS 2907.29.90.00
Resorcinol (1,3-Benzenediol)
Resorcinol is a dihydroxybenzene (polyphenol) used in the production of resins, dyes, and pharmaceuticals. It falls under HTS 2907.29.90.00 as a polyphenolic compound that is chemically defined and not specifically provided for elsewhere in heading 2907. This white crystalline solid is a key intermediate in organic synthesis.
Hydroquinone (1,4-Benzenediol)
Hydroquinone is a polyphenol used as a photographic developer, antioxidant, and in skin lightening products. Classified under HTS 2907.29.90.00 as 'other' polyphenols, it features two hydroxyl groups on a benzene ring. This compound requires careful handling due to its oxidizing properties.
Pyrogallol (1,2,3-Benzenetriol)
Pyrogallol is a trihydroxybenzene (polyphenol) used in analytical chemistry, hair dyes, and as a reducing agent. It qualifies for HTS 2907.29.90.00 as a polyphenol not elsewhere specified, distinguished by three phenolic hydroxyl groups. This highly reactive compound requires stabilization for commercial transport.
Phloroglucinol (1,3,5-Benzenetriol)
Phloroglucinol is a symmetrical triphenol used in pharmaceuticals, explosives, and as a reagent for phloroglucinol test. Under HTS 2907.29.90.00 as 'other' polyphenols, it features three hydroxyl groups meta-positioned on benzene. Primarily supplied as dihydrate for stability.
Catechol (1,2-Benzenediol)
Catechol, also known as pyrocatechol, is a dihydric phenol used in photography, dyes, and antioxidants. Classified in HTS 2907.29.90.00 as other polyphenols, it has adjacent hydroxyl groups on benzene ring. Industrial applications include rubber antioxidants and electroplating.
Guaiacol (2-Methoxyphenol)
Guaiacol is a methyl ether of catechol used as expectorant, flavoring agent, and in resins. Falls under HTS 2907.29.90.00 as phenol derivative (phenol-alcohol per hierarchy), though technically monophenolic with methoxy group. Extracted from wood creosote or synthesized.