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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing nitrogen hetero-atoms
Compounds with additional heteroatoms beyond oxygen only classify later in numerical order.
If considered phenoxy derivative
Certain aromatic compounds with lactone-like structures may classify under phenol derivatives.
If classified as nucleoside/nucleotide analog
Lactone derivatives used in pharmaceutical intermediates may shift to heterocyclic nucleic acid analogs.
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
• Submit NMR or mass spectrometry data verifying the fused aromatic lactone structure for proper Chapter 29 classification
• Declare intended use as chemical intermediate only; avoid consumer packaging that suggests retail sale
• Ensure stabilizer additions qualify under Chapter note (f) for preservation without changing classification
Related Products 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.
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.