What is HS-4 2933 used for?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
HS-4 · Heading
2933 — Heterocyclic compounds with nitrogen hetero-atom(s) only
Chapter 29: Organic chemicals
Plain-language overview
Use HS-4 2933 when importing or exporting heterocyclic compounds that contain only nitrogen as a hetero-atom. For example, if you're shipping a pharmaceutical product containing a pyridine ring, this heading is relevant.
Choosing the correct HS-6 line under this heading depends on the specific structure of the compound. For instance, if your product includes an unfused pyrazole ring and is phenazone or its derivatives, you should classify it under HS-6 293311. If it contains a similar structure but is not phenazone, opt for HS-6 293319.
When your compound features an imidazole ring, the distinction between HS-6 293321 and HS-6 293329 is crucial. Use 293321 for hydantoin and its derivatives, while 293329 covers other imidazole derivatives. Understanding these nuances helps ensure compliance and accurate duty calculations.
Keywords & topics
Useful terms traders and brokers use for this HS-4 heading.
HS-4 2933 · heterocyclic compounds · nitrogen hetero-atom · pyridine ring · imidazole ring · pyrazole ring · barbiturates · pharmaceutical compounds · import codes · export classifications
Examples
Drawn from the official tariff wording for this HS-4 heading. Always confirm against your published schedule and legal notes.
- Phenazone (antipyrin) and its derivatives under **293311**
- Hydantoin compounds classified as **293321**
- Pyridine derivatives like alfentanil under **293333**
- Melamine categorized as **293361**
- Barbiturates such as phenobarbital under **293353**
- Other heterocyclic compounds not elsewhere classified under **293399**
Common questions
Frequent classification questions with short practical guidance.
How to classify heterocyclic compounds for import?
Write down material, use, and product form first, then compare nearby lines before you lock the code.
What are the differences between HS-6 lines under 2933?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
Which code to use for pyridine derivatives?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
How to determine if a compound fits under HS-4 2933?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
What are examples of compounds classified under HS-4 2933?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
Related topics
Common real-world topics that come up during code comparison.
how to classify heterocyclic compounds with nitrogen
Use this topic to narrow your shortlist, then validate the final code against legal wording.
differences between HS-6 lines under 2933
Compare adjacent HS lines and pick the one that matches material, function, and product form most closely.
examples of heterocyclic compounds for import
Check the exact product specs and destination-country tariff notes before finalizing the code.
importing pyrazole derivatives under HS-4 2933
Check the exact product specs and destination-country tariff notes before finalizing the code.
choosing the right HS-6 code for pharmaceuticals
Use this topic to narrow your shortlist, then validate the final code against legal wording.
what to do if my compound is not listed in HS-4 2933
Use this topic to narrow your shortlist, then validate the final code against legal wording.
understanding nitrogen hetero-atom classifications
Use this topic to narrow your shortlist, then validate the final code against legal wording.
how to find the correct HS code for barbiturates
Use this topic to narrow your shortlist, then validate the final code against legal wording.
Questions & answers
For orientation only—the binding text is your national tariff and the WCO nomenclature your country uses.
- What types of compounds fall under HS-4 2933?
- HS-4 2933 covers heterocyclic compounds that contain only nitrogen as a hetero-atom, including various derivatives like pyrazole, imidazole, and pyridine.
- How do I determine the correct HS-6 code for my product?
- Identify the specific structure of your compound. For example, if it contains a specific ring structure like pyridine or imidazole, refer to the appropriate HS-6 line under 2933.
- What if my compound doesn't fit neatly into one of the HS-6 categories?
- If your compound is not classified under any specific HS-6 line, you may need to use the 'not elsewhere classified' option, which is **HS-6 293399**.
- Are there any specific regulations for importing these compounds?
- Yes, certain heterocyclic compounds may be subject to additional regulations, especially if they are pharmaceuticals or controlled substances. Always check with customs or a trade compliance expert.
- Can I use HS-4 2933 for exporting as well?
- Yes, HS-4 2933 can be used for both importing and exporting heterocyclic compounds that fit the description provided under this heading.
Continue classification
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Heading-browse mode uses HS-6 293300 (first line of this block).
HS-6 subheadings (27)
- 293311Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused pyrazole ring (whether or not hydrogenated) in the structure, phenazone (antipyrin) and its derivatives
- 293319Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused pyrazole ring (whether or not hydrogenated) in the structure, other than henazone (antipyrin) and its derivatives
- 293321Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused imidazole ring (whether or not hydrogenated) in the structure, hydantoin and its derivatives
- 293329Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused imidazole ring (whether or not hydrogenated) in the structure, other than hydantoin and its derivatives
- 293331Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, pyridine and its salts
- 293332Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, piperidine and its salts
- 293333Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, alfentanil (INN), anileridine (INN), bezitramide (INN), bromazepam (INN), carfentanil (INN), difenoxin (INN), diphenoxylate (INN), dipipanone (INN)
- 293334Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, other fentanyls and their derivatives
- 293335Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, 3-quinuclidinol
- 293336Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, 4-anilino-N-phenethylpiperidine (ANPP)
- 293337Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, N-phenethyl-4-piperdone (NPP)
- 293339Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, n.e.c. in 2933.3
- 293341Heterocyclic compounds; containing a quinoline or isoquinoline ring-system (whether or not hydrogenated) in the structure, not further fused, levorphanol (INN) and its salts
- 293349Heterocyclic compounds; containing a quinoline or isoquinoline ring-system (whether or not hydrogenated) in the structure, not further fused, other than levorphanol (INN) and its salts
- 293352Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, malonylurea (barbituric acid) and its salts
- 293353Allobarbital (INN), amobarbital (INN), barbital (INN), butalbital (INN), butobarbital, cyclobarbital (INN), methylphenobarbital (INN), pentobarbital (INN), phenobarbital (INN), secbutabarbital (INN), secobarbital (INN) and vinylbital (INN); salts thereof
- 293354Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, other derivatives of malonylurea (barbituric acid) and salts thereof, n.e.c. in 2933.53
- 293355Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure; loprazolam (INN), mecloqualone (INN), methaqualone (INN), and zipeprol (INN); salts thereof
- 293359Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, (other than malonylurea and its derivatives, loprazolam, mecloqualone, methaqualone, zipeprol, and salts thereof) n.e.c. in 2933.5
- 293361Heterocyclic compounds; containing an unfused triazine ring (whether or not hydrogenated) in the structure, melamine
- 293369Heterocyclic compounds; containing an unfused triazine ring (whether or not hydrogenated) in the structure, others excluding melamine
- 293371Heterocyclic compounds; lactams; 6-hexanelactam (epsilon-caprolactam)
- 293372Heterocyclic compounds; lactams; clobazam (INN) and methyprylon (INN)
- 293379Heterocyclic compounds; lactams; other than 6-hexanelactam (epsilon caprolactam) and clobazam (INN) and methyprylon (INN)
- 293391Heterocyclic compounds; alprazolam (INN), camazepam (INN), chlordiazepoxide (INN), clonazepam (INN), clorazepate, delorazepam (INN), diazepam (INN), estazolam (INN), ethyl loflazepate (INN), fludiazepam (INN), flunitrazepam (INN), (cont)
- 293392Heterocyclic compounds; azinphos-methyl (ISO)
- 293399Heterocyclic compounds; n.e.c. in headings no. 2933