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Heterocyclic compounds with oxygen hetero-atom(s) only: > Lactones: > Other: > Aromatic: > Other: > Other: > Other

Duty Rate (from China)

16.5%
MFN Base Rate6.5%
9903.03.01+10%

Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter

Total Effective Rate16.5%
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Products classified under HTS 2932.20.45.00

Coumarin

Coumarin is an aromatic lactone compound with a fused benzene ring and α-pyrone ring, classified under HTS 2932.20.4500 as an aromatic heterocyclic lactone with oxygen hetero-atom only. It is commonly used as a fragrance in perfumes and flavoring agent in tobacco products.

Phthalide

Phthalide is a bicyclic aromatic lactone consisting of a benzene ring fused to a five-membered γ-lactone ring, falling under HTS 2932.20.4500 as an aromatic lactone. It serves as an intermediate in pharmaceutical synthesis and dye production.

γ-Butyrolactone (Aromatic Derivatives)

Aromatic-substituted γ-butyrolactones are five-membered lactone rings with aromatic substituents, classified under HTS 2932.20.4500 as aromatic oxygen-heterocyclic lactones. Used as solvents and pharmaceutical intermediates.

Ascorbic Acid Lactone

Ascorbic acid (Vitamin C) contains a five-membered lactone ring with enediol functionality, classified as an aromatic-type heterocyclic lactone under HTS 2932.20.4500. Imported as bulk pharmaceutical and nutritional supplement intermediate.

Phthalolactone Blue Intermediate

Phthalolactone derivatives used as intermediates for blue dyes feature aromatic fused lactone structures, falling under HTS 2932.20.4500. Essential for pigment manufacturing.

Benzofuran-2(3H)-one

Benzofuran-2(3H)-one is a fused benzene-pyrrolidone lactone system classified as aromatic heterocyclic lactone under HTS 2932.20.4500. Used in pharmaceutical and polymer synthesis.

6-Hydroxy coumarin (Umbelliferone)

Umbelliferone (6-hydroxycoumarin) is a phenolic derivative of coumarin lactone with aromatic heterocyclic structure under HTS 2932.20.4500. Used in cosmetics and fluorescent indicators.