Proxyphylline Pure Substance
Proxyphylline is 7-(2-hydroxypropyl)theophylline, a theophylline derivative used as an expectorant. It is a separate chemically defined compound, classified under tariff item 2939.59.00 as 'Other' theophylline derivatives. The product is a bulk pharmaceutical chemical.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
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Import Tips & Compliance
• Confirm the product is not a mixture of isomers; if it is, Chapter Note 1(b) applies
• Provide a certificate of analysis to CBSA to verify purity
• Check if the product is listed in the Prescription Drug List (PDL) for import controls
Related Products under Tariff item 2939.59.00
Acefylline Piperazine Salt
Acefylline piperazine is a salt formed between acefylline (theophylline-7-acetic acid) and piperazine, used as a vasodilator. As an organic salt of a theophylline derivative, it is classified under tariff item 2939.59.00 as 'Other' theophylline derivatives, per Chapter 29 Note 5(C)(1).
Aminophylline Powder
Aminophylline is a defined complex of theophylline and ethylenediamine, explicitly listed in the tariff item description. It is a bronchodilator used in asthma and COPD treatments. The product is a separate chemically defined compound, qualifying under Chapter 29 Note 1(a).
Bamethan Theophylline
Bamethan theophylline is a combination of the vasodilator bamethan and theophylline, forming a salt or derivative. As a theophylline derivative with an additional amine function, it falls under tariff item 2939.59.00 as 'Other'. The product is a separate chemically defined compound used in circulatory medications.
Caffeine Anhydrous Powder
Caffeine anhydrous is a xanthine alkaloid, structurally related to theophylline but with a different methyl substitution pattern. It is not a theophylline derivative; it is a separate alkaloid of heading 29.39. Therefore, it does not fall under tariff item 2939.59.00 but under a different subheading for caffeine.
Choline Theophyllinate
Choline theophyllinate is a quaternary ammonium salt of theophylline, used for its gastric protection properties. As an organic salt of a theophylline derivative, it is classified under tariff item 2939.59.00 as 'Other', per Chapter 29 Note 5(C)(1). The product is a separate chemically defined compound.
Dyphylline API
Dyphylline is 7-(2,3-dihydroxypropyl)theophylline, a theophylline derivative used as a bronchodilator. It is a separate chemically defined compound, classified under tariff item 2939.59.00 as 'Other' theophylline derivatives. The product is a pure active pharmaceutical ingredient (API).