Piperidine-4-Carboxylic Acid
Piperidine-4-carboxylic acid (isonipecotic acid) contains both piperidine ring and carboxylic acid functionality but classifies under HTS 2933.32.5000 per Chapter 29 notes prioritizing heterocyclic structure. Used in synthesis of protease inhibitors.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If carboxylic acid function deemed principal characteristic
Benzenecarboxylic acids take precedence but aliphatic acids may shift if not heterocyclic-specific
If for nipecotic acid esters rather than free acid
Esters classified with parent acid per Chapter 29 note on ester classification
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Import Tips & Compliance
• Include COA specifying free acid form vs salt to prevent classification disputes
• Package under UN 3261 as corrosive solid, pH <2 in aqueous solution
• Pre-register with FDA if destined for pharmaceutical manufacturing
Related Products under HTS 2933.32.50.00
Piperidine Hydrochloride
Piperidine hydrochloride is the salt form of piperidine, a heterocyclic compound containing an unfused piperidine ring, classified under HTS 2933.32.5000 as 'other' piperidine and its salts. It is commonly used as a chemical intermediate in pharmaceutical synthesis and as a catalyst in organic reactions.
4-Aminopiperidine Dihydrochloride
4-Aminopiperidine dihydrochloride is a substituted piperidine salt used in synthesis of pharmaceutical intermediates like antihistamines. It features the core piperidine ring structure required for HTS 2933.32.5000 classification as 'other' piperidine salts.
1-Methylpiperidine
1-Methylpiperidine is an N-alkylated derivative of piperidine, a saturated six-membered heterocyclic amine fitting HTS 2933.32.5000 as 'other' piperidine compounds. Used as a base in organic synthesis and solvent in chemical manufacturing.
4-Phenylpiperidine Hydrochloride
4-Phenylpiperidine hydrochloride is a key intermediate for opioid analgesics like pethidine (meperidine). The core piperidine ring structure qualifies it for HTS 2933.32.5000 as 'other' piperidine salt despite phenyl substitution.
1-Benzylpiperidine
1-Benzylpiperidine is an N-protected piperidine derivative used in medicinal chemistry. Its unfused piperidine ring structure places it under HTS 2933.32.5000 as 'other' piperidine compound, not classified by benzyl group per Chapter notes.
Piperidine-1-Carboxylic Acid tert-Butyl Ester
Boc-piperidine (piperidine-1-carboxylic acid tert-butyl ester) is a protected piperidine used in peptide synthesis. Classifies under HTS 2933.32.5000 as the ester follows parent piperidine per Chapter 29 ester classification rules.