Phthalide
Phthalide is a bicyclic lactone with a five-membered oxygen-containing heterocyclic ring fused to benzene, classified under 2932.20.50.50. Used as an intermediate in dye and pharmaceutical synthesis.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing additional nitrogen hetero-atoms in derivatives
Nitrogen heterocyclic compounds take precedence over oxygen-only lactones per Chapter 29 numerical order.
If classified as aromatic polycarboxylic acid derivative
Phthalic anhydride derivatives sometimes classified by acid function rather than lactone ring.
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/IR spectra confirming lactone structure to distinguish from phthalide derivatives
• Verify no sulfonation/halogenation per Chapter 29 exclusion notes to maintain classification
• Include end-use statement if for R&D to qualify for duty-free treatment under certain HTSUS provisions
Related Products under HTS 2932.20.50.50
Gamma-Butyrolactone (GBL)
Gamma-Butyrolactone is a five-membered lactone ring heterocyclic compound with oxygen as the sole hetero-atom, classified under HTS 2932.20.50.50 as 'other lactones.' It is a colorless liquid used as a solvent and intermediate in pharmaceutical and polymer production.
Ascorbic Acid (Vitamin C) Lactone
Ascorbic acid contains a five-membered lactone ring with oxygen hetero-atom, falling under HTS 2932.20.50.50 as other lactones. This essential vitamin is used in food supplements, cosmetics, and pharmaceuticals for its antioxidant properties.
Butyrolactone Technical Grade
Technical grade gamma-butyrolactone (GBL) with ≥99% purity, a simple five-membered lactone ring compound under HTS 2932.20.50.50. Used in resin production and as a polymer solvent.
Glucono-Delta-Lactone (GDL)
Glucono-delta-lactone is a six-membered lactone ring derived from gluconic acid, classified as other lactones under HTS 2932.20.50.50. Widely used as a slow-release acidulant in food processing.
Pantolactone
Pantolactone, a five-membered lactone used in pantothenic acid (Vitamin B5) synthesis, classified under HTS 2932.20.50.50 for other oxygen-heterocycle lactones. Essential intermediate for vitamin production.
Epsilon-Caprolactone
Epsilon-caprolactone is a seven-membered lactone ring used in polymer synthesis for biomedical applications, classified under HTS 2932.20.50.50. Key monomer for biodegradable polycaprolactone.