Piperidine-4-Carboxylic Acid
Piperidine-4-carboxylic acid, also known as isonipecotic acid, is a piperidine derivative with a carboxylic acid functional group at the 4-position. Despite the additional acid functionality, Chapter 29 notes direct classification with the heterocyclic compound, piperidine, as the ring structure determines the heading. It is used as an intermediate in pharmaceutical synthesis.
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 |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the compound is not a piperidine but a different pyridine derivative
Covers other unfused pyridine-ring compounds not specifically listed under piperidine.
If the carboxylic acid function is considered the primary characteristic
Although not typical, this alternative would apply if the product were classified as a cyclanic acid, but Chapter 29 note 3 prioritizes the heterocyclic structure.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Classify piperidine-4-carboxylic acid under 2933.32.00 as a piperidine salt or derivative; the carboxylic acid group does not change the classification
• Provide the chemical name and CAS number on shipping documents to avoid delays
• Check if the product is subject to the Canadian Environmental Protection Act, 1999 (CEPA) for import notification
Related Products under Tariff item 2933.32.00
1-(2-Methoxyethyl)piperidine
1-(2-Methoxyethyl)piperidine is an ether-substituted piperidine used as a synthetic intermediate. Its core piperidine ring structure qualifies it under tariff item 2933.32.00, as the subheading covers piperidine and its salts, including derivatives with substituents on the ring. It is a chemically defined organic compound.
1-Benzylpiperidine
1-Benzylpiperidine is an N-protected piperidine derivative used in medicinal chemistry. The unfused piperidine ring structure places it under tariff item 2933.32.00, as the subheading covers piperidine and its salts, including N-substituted derivatives. It is a chemically defined organic compound.
1-Methylpiperidine
1-Methylpiperidine is an N-alkylated derivative of piperidine, a saturated six-membered heterocyclic amine. It is used as a base in organic synthesis and as a solvent. It falls under tariff item 2933.32.00 as a piperidine derivative, covered by the subheading for piperidine and its salts.
3,5-Dimethylpiperidine
3,5-Dimethylpiperidine is a dialkylated piperidine derivative used in chiral ligand synthesis. As a simple substituted piperidine, it falls under tariff item 2933.32.00, which covers piperidine and its salts, including alkyl-substituted derivatives. It is a chemically defined organic compound.
4-Aminopiperidine Dihydrochloride
4-Aminopiperidine Dihydrochloride is a substituted piperidine salt used in the synthesis of pharmaceutical intermediates. It features the core piperidine ring structure and is a salt, so it falls under tariff item 2933.32.00, which covers piperidine and its salts. The amino group does not change the classification.
4-Phenylpiperidine Hydrochloride
4-Phenylpiperidine Hydrochloride is a key intermediate for opioid analgesics like pethidine. The core piperidine ring structure qualifies it for tariff item 2933.32.00 as a piperidine salt, despite the phenyl substituent. It is a chemically defined organic compound.