# United States tariff line 2933.39.61.40: N-phenyl-4-piperidinamine (4-AP), tert-butyl 4-(phenylamino)piperidine-1-carboxylate (tert-butyl 4-anilinopiperidine-1-carboxylate, 1-boc-4-AP), norfentanyl (N-phenyl-N-(4-piperidyl)propionamide), piperidin-4-one (4-piperidone) and tert-butyl 4-oxopiperidine-1-carboxylate (1-boc-4-piperidone); salts thereof

> In the United States tariff, line 2933.39.61.40 covers compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, products described in additional U.S. note 3 to section VI, N-phenyl-4-piperidinamine (4-AP), tert-butyl 4-(phenylamino)piperidine-1-carboxylate (tert-butyl 4-anilinopiperidine-1-carboxylate, 1-boc-4-AP), norfentanyl (N-phenyl-N-(4-piperidyl)propionamide), piperidin-4-one (4-piperidone) and tert-butyl 4-oxopiperidine-1-carboxylate (1-boc-4-piperidone); salts thereof. The general (MFN) duty rate is 6.5%. It falls under HS subheading 2933.39 in heading 29.33 (chapter 29).

Source: https://border.bot/countries/united-states/hs-codes/2933396140
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 29](https://border.bot/countries/united-states/hs-codes/29) / [2933.39](https://border.bot/countries/united-states/hs-codes/293339) / [2933.39.61.40](https://border.bot/countries/united-states/hs-codes/2933396140)

## Key facts

- Tariff line: 2933.39.61.40
- Covers: Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, products described in additional U.S. note 3 to section VI, N-phenyl-4-piperidinamine (4-AP), tert-butyl 4-(phenylamino)piperidine-1-carboxylate (tert-butyl 4-anilinopiperidine-1-carboxylate, 1-boc-4-AP), norfentanyl (N-phenyl-N-(4-piperidyl)propionamide), piperidin-4-one (4-piperidone) and tert-butyl 4-oxopiperidine-1-carboxylate (1-boc-4-piperidone); salts thereof
- Duty (MFN): 6.5%
- Preferential rates: From free (17 programmes or origins)
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [2933.39](https://border.bot/hs-codes/293339)

## What this line covers

In the United States tariff, line 2933.39.61.40 covers compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, products described in additional U.S. note 3 to section VI, N-phenyl-4-piperidinamine (4-AP), tert-butyl 4-(phenylamino)piperidine-1-carboxylate (tert-butyl 4-anilinopiperidine-1-carboxylate, 1-boc-4-AP), norfentanyl (N-phenyl-N-(4-piperidyl)propionamide), piperidin-4-one (4-piperidone) and tert-butyl 4-oxopiperidine-1-carboxylate (1-boc-4-piperidone); salts thereof.

Its legal text is “N-phenyl-4-piperidinamine (4-AP), tert-butyl 4-(phenylamino)piperidine-1-carboxylate (tert-butyl 4-anilinopiperidine-1-carboxylate, 1-boc-4-AP), norfentanyl (N-phenyl-N-(4-piperidyl)propionamide), piperidin-4-one (4-piperidone) and tert-butyl 4-oxopiperidine-1-carboxylate (1-boc-4-piperidone); salts thereof”, read under “Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure”, “Other”, “Other”, “Other”, “Products described in additional U.S. note 3 to section VI” and “Other”.

Products commonly classified here include 2,3-Dichloro-5-(trifluoromethyl)pyridine (CAS No. 69045-84-7), 2-Acetylnicotinic acid (CAS No. 89942-59-6), Bis(2,2,6,6-tetramethyl-1-octyloxy-4-piperidyl) sebacate (CAS No. 129757-67-1), 5-Methylmethoxypyridine-2,3-dicarboxylic acid (CAS No. 143382-03-0) and Dimethyl 5-methylpyridine-2,3-dicarboxylate (CAS No. 112110-16-4) (border.bot’s search keywords, not legal text).

## How it is structured

It falls under HS subheading 2933.39 in heading 29.33 (chapter 29). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 29: Organic chemicals
- Heading 29.33: Heterocyclic compounds with nitrogen hetero-atom(s) only
- Subheading 2933.39: Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure
- Within the subheading: Other
- Within the subheading: Other
- Within the subheading: Other
- Within the subheading: Products described in additional U.S. note 3 to section VI
- Within the subheading: Other
- Line 2933.39.61.40: N-phenyl-4-piperidinamine (4-AP), tert-butyl 4-(phenylamino)piperidine-1-carboxylate (tert-butyl 4-anilinopiperidine-1-carboxylate, 1-boc-4-AP), norfentanyl (N-phenyl-N-(4-piperidyl)propionamide), piperidin-4-one (4-piperidone) and tert-butyl 4-oxopiperidine-1-carboxylate (1-boc-4-piperidone); salts thereof

## Duty

The general (MFN) duty rate is 6.5%.

The rate is published on 2933.39.61.

Duty-free entry applies to goods that qualify under 16 programmes, and to goods from a group of origins (origin group A+).

- Free: a group of origins (origin group A+) (A+)
- Free: United States-Australia Free Trade Agreement (AU)
- Free: United States-Bahrain Free Trade Agreement Implementation Act (BH)
- Free: United States-Chile Free Trade Agreement (CL)
- Free: United States-Colombia Trade Promotion Agreement Implementation Act (CO)
- Free: African Growth and Opportunity Act (D)
- Free: Caribbean Basin Economic Recovery Act (E)
- Free: United States-Israel Free Trade Area (IL)
- Free: United States-Jordan Free Trade Area Implementation Act (JO)
- Free: United States-Korea Free Trade Agreement Implementation Act (KR)
- Free: United States-Morocco Free Trade Agreement Implementation Act (MA)
- Free: United States-Oman Free Trade Agreement Implementation Act (OM)
- Free: Dominican Republic-Central America-United States Free Trade Agreement (P)
- Free: United States-Panama Trade Promotion Agreement Implementation Act (PA)
- Free: United States-Peru Trade Promotion Agreement Implementation Act (PE)
- Free: United States-Mexico-Canada Agreement (S)
- Free: United States-Singapore Free Trade Agreement (SG)

## In other countries

No other national tariff on border.bot has live lines under 2933.39 yet.

- [The Harmonized System text for 2933.39](https://border.bot/hs-codes/293339)

## Other lines under 2933.39

- [2933.39.08.00](https://border.bot/countries/united-states/hs-codes/2933390800) 1-(3-Sulfo propyl) pyridinium hydroxide;N,N'-Bis (2,2,6,6-tetra methyl-4-piperidinyl)-1,6- hexane diamine; 3,5-Dimethyl-2-hydroxy methyl-4-methoxy- pyridine (pyrmethyl alcohol); Dipenta methylene thiuram tetra sulfide; 2H-Indol-2-one,1,3-dihydro-1-phenyl-3-(4- pyridinyl methylene); 4-Picolyl chloride hydro chloride; and Piperidino ethyl chloride hydro chloride
- [2933.39.10.00](https://border.bot/countries/united-states/hs-codes/2933391000) Collidines, lutidines and picolines
- [2933.39.20.00](https://border.bot/countries/united-states/hs-codes/2933392000) p-Chloro-2-benzylpyridine; 4-Chloro-1-methylpiperidine hydrochloride; 1,4-Dimethyl-6-hydroxy-3-cyanopyrid-2-one; Di-(2,2,6,6-tetramethyl-4-hydroxy- piperidine)sebacate; 2-Methyl-5-ethylpyridine; 4-Phenylpropylpyridine; α-Phenylpyridylacetic acid, methyl ester; Picolinic acid; 2-Pyridinecarboxaldehyde; and 2,5-Pyridinedicarboxylic acid
- [2933.39.21.00](https://border.bot/countries/united-states/hs-codes/2933392100) Fungicides
- [2933.39.23.00](https://border.bot/countries/united-states/hs-codes/2933392300) o-Paraquat dichloride
- [2933.39.25.00](https://border.bot/countries/united-states/hs-codes/2933392500) Other
- [2933.39.27.00](https://border.bot/countries/united-states/hs-codes/2933392700) Other
- [2933.39.31.00](https://border.bot/countries/united-states/hs-codes/2933393100) Antidepressants, tranquilizers and other psychotherapeutic agents
- [2933.39.41.00](https://border.bot/countries/united-states/hs-codes/2933394100) Other
- [2933.39.61.10](https://border.bot/countries/united-states/hs-codes/2933396110) 3-Quinuclidinyl benzilate
- [2933.39.61.20](https://border.bot/countries/united-states/hs-codes/2933396120) 1-[N,N-Dialkyl (≤C10)-N-(n-(hydroxyl, cyano, acetoxy)alkyl (≤C10)) ammonio]-n-n-[N-(3- dimethylcarbamoxy-α-picolinyl)-N,N-dialkyl (≤C10) ammonio]decane dibromide (n=1-8)
- [2933.39.61.30](https://border.bot/countries/united-states/hs-codes/2933396130) 1,n-Bis[N-(3-dimethylcarbamoxy-α-picolyl)- N,N-dialkyl (≤ C10) ammonio]-alkane-(2,(n-1)- dione) dibromide (n=2-12)
- [2933.39.61.92](https://border.bot/countries/united-states/hs-codes/2933396192) Other
- [2933.39.92.00](https://border.bot/countries/united-states/hs-codes/2933399200) Other

- Previous line: [2933.39.61.30](https://border.bot/countries/united-states/hs-codes/2933396130) 1,n-Bis[N-(3-dimethylcarbamoxy-α-picolyl)- N,N-dialkyl (≤ C10) ammonio]-alkane-(2,(n-1)- dione) dibromide (n=2-12)
- Next line: [2933.39.61.92](https://border.bot/countries/united-states/hs-codes/2933396192) Other

## Frequently asked questions

### What does tariff line 2933.39.61.40 cover in the United States tariff?

In the United States tariff, line 2933.39.61.40 covers compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, products described in additional U.S. note 3 to section VI, N-phenyl-4-piperidinamine (4-AP), tert-butyl 4-(phenylamino)piperidine-1-carboxylate (tert-butyl 4-anilinopiperidine-1-carboxylate, 1-boc-4-AP), norfentanyl (N-phenyl-N-(4-piperidyl)propionamide), piperidin-4-one (4-piperidone) and tert-butyl 4-oxopiperidine-1-carboxylate (1-boc-4-piperidone); salts thereof.

### What is the general (MFN) duty on 2933.39.61.40 in the United States?

The general (MFN) duty rate is 6.5%. The rate is published on 2933.39.61.

### Which preferential rates apply to 2933.39.61.40?

Duty-free entry applies to goods that qualify under 16 programmes: the United States-Australia Free Trade Agreement, the United States-Bahrain Free Trade Agreement Implementation Act, the United States-Chile Free Trade Agreement, the United States-Colombia Trade Promotion Agreement Implementation Act, African Growth and Opportunity Act, Caribbean Basin Economic Recovery Act, the United States-Israel Free Trade Area, the United States-Jordan Free Trade Area Implementation Act, the United States-Korea Free Trade Agreement Implementation Act, the United States-Morocco Free Trade Agreement Implementation Act, the United States-Oman Free Trade Agreement Implementation Act, the Dominican Republic-Central America-United States Free Trade Agreement, the United States-Panama Trade Promotion Agreement Implementation Act, the United States-Peru Trade Promotion Agreement Implementation Act, the United States-Mexico-Canada Agreement and the United States-Singapore Free Trade Agreement, and to goods from a group of origins (origin group A+).

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 October 2026.

Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/2933396140.json